Master Spas MP Force User manual

OWNER’S MANUAL
& LIMITED WARRANTY

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MASTER SPAS OWNER’S MANUAL
Welcome to the Ultimate in Relaxation!
Thank you for choosing your new swim spa built by Master Spas. For how-to videos and helpful
tips on operating and maintaining your swim spa, please visit www.masterspas.com/resources.
Please read the entire Owner’s Manual before installing and using your swim spa. The goal of this
manual is to provide you with safety and operational information plus some tips that will help you
enjoy your swim spa to its fullest. At the time of print, this manual is accurate in its information.
Master Spas reserves the right to change or improve its product without prior notice.
REGISTER YOUR SWIM SPA
Please be sure to register your swim spa so we can efficiently assist with any questions you may
have. Until your swim spa has been registered, Master Spas will not have record of your ownership.
To register your swim spa, visit www.masterspas.com/resources and click on Spa Registration.
SERIAL NUMBER LOCATION
The serial number for your swim spa is located near the filter area, on the swim spa system pack,
or on the listing plate on the skirting. It will start with “H” followed by a 6 digit number. For
example, H191234.
RECORD OF OWNERSHIP
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Phone Number (������) ��������-����������� Date Purchased �������� /�������� /�����������
Model ��������������������������������� Serial #���������������������������������������
Dealer Name �������������������������������������������������������������������������
Service Tech Rep ����������������������������������������������������������������������
6927 Lincoln Parkway
Fort Wayne, IN 46804
masterspas.com
WATCH HOW-TO VIDEOS:
masterspas.com/video-tutorials

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TABLE OF CONTENTS
Safety Instructions.................................................................................................................... 2-9
Compliance................................................................................................................................. 10
VGB Suction Safety & Maintenance Instructions ............................................................... 11-12
Glossary of Swim Spa Terminology .................................................................................... 13-15
The Advantages of EcoPur®Charge .................................................................................... 16-17
Water Chemistry Terms You Should Know........................................................................ 18-19
Why Are Chemicals Important in a Swim Spa ........................................................................ 20
Water Maintenance .............................................................................................................. 21-24
Start-Up ............................................................................................................................... 21
Schedule.......................................................................................................................... 22-23
Troubleshooting Guide.......................................................................................................... 24
Regular Maintenance Procedures........................................................................................ 25-31
Swim Spa Troubleshooting Guide....................................................................................... 32-33
Winterizing & Storing Your Swim Spa .................................................................................... 34
Model Specifications ................................................................................................................. 35
Installation Instructions........................................................................................................ 36-46
Site Preparation / General Guidelines ................................................................................ 36-38
Electrical Requirements .................................................................................................... 39-46
Configuration 3........................................................................................................ 39-40
Configuration 5........................................................................................................ 41-42
Configuration 7........................................................................................................ 43-44
Initial Spa Setup ............................................................................................................... 45-46
Operating Instructions ......................................................................................................... 47-98
Spa Controls - Icon Spa Touch ......................................................................................... 47-77
Spa Controls - Pump Diagrams ........................................................................................ 78-80
Propulsion System Controls.............................................................................................. 81-91
Propulsion System Technical Information............................................................................... 92
Fusion Air Sound System (if equipped) ............................................................................. 93-97
Wave Lighting (if equipped) .................................................................................................. 98
Mast3rPurTM (if equipped) .................................................................................................. 99-101
SoftTreadTM Floor System by SwimDek®(if equipped) ......................................................... 102
Limited Warranty.............................................................................................................. 103-106
Swim Spa Care & Maintenance Record........................................................................... 107-113

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SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
Included with your new swim spa is a safety sign. The sign is for you and your guest’s
protection and is suitable for outdoor use in wet locations. The sign should be placed in a
location visible to all users of the swim spa.
Please take time to point out the physical location of the safety sign and the importance of
the safety precautions displayed on the safety sign to all of your guests. Remember, your safety
and the safety of anyone who enjoys the use of your swim spa is our utmost concern.
The sign should be mounted with screws or another type of permanent fastener. Additional
or replacement signs can be obtained from your dealer or direct from the factory.
INTRODUCTION
It’s time to relax! You now have your very own portable swim spa by Master Spas. By fully
understanding the operation of each of the features of your new Master Spa, you will be assured
of many years of hassle-free, hot water therapy and fun.
Your safety is of paramount importance to the Master Spas family. We urge you to read and
become thoroughly familiar with all safety aspects addressed in this manual.
Through reading and totally understanding the important information in your owner’s manual,
you will realize that you now own THE ULTIMATE RELAXATION MACHINE!®

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SAFETY INSTRUCTIONS
IMPORTANT SAFETY INSTRUCTIONS
When installing and using this electrical equipment, basic safety precautions should
be observed including the following:
READ AND FOLLOW ALL
INSTRUCTIONS
WARNING – To reduce the risk of injury, do not permit children to use this product
unless they are closely supervised at all times.
A wire conductor is provided on this unit to connect a minimum 6 AWG
(13.302mm2) solid copper conductor between this unit and any metal equipment,
metal enclosures of electrical equipment, metal water pipe, or conduit within 5 feet
(1.5m) of the unit.
(For cord-connected/convertible units)
DANGER – Risk of injury.
a) Replace damaged cord immediately.
b) Do not bury cord.
c) Connect to a grounded, grounding type receptacle only.
(For units intended for indoor use only)
WARNING – For indoor use only. This unit is not intended for outdoor use.
(For units intended for outdoor use only)
WARNING – For outdoor use only. This unit is not intended for indoor use.

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SAFETY INSTRUCTIONS
IMPORTANT SAFETY
INSTRUCTIONS (CONT.)
(For units with GFCI)
WARNING – This product is provided with a ground-fault circuit interrupter
located on the front panel of selected swim spas and on the power cord of
120 volt convertible spas. The GFCI must be tested before each use. With
the product operating, open the service door. When the product stops
operating, this merely indicates that the door is equipped with an electrical
interlock. Next, push the test button on the GFCI and close the service door.
The product should not operate. Now open the service door, push the reset
button on the GFCI and close the service door. The product should now
operate normally. When the product fails to operate in this manner, there
is a ground current flowing indicating the possibility of an electric shock.
Disconnect the power until the fault has been identified and corrected.
DANGER – Risk of Accidental Drowning. Extreme caution must be exercised to
prevent unauthorized access by children. To avoid accidents, ensure that children
cannot use this swim spa unless they are supervised at all times.
DANGER – Risk of Injury. The suction fittings in this swim spa are sized to match
the specific water flow created by the pump. Should the need arise to replace the
suction fittings or the pump, be sure that the flow rates are compatible.
Never operate swim spa if the suction fittings are broken or missing. Never replace
a suction fitting with one rated less than the flow rate marked on the original
suction fitting.
DANGER – Risk of Electric Shock. Install at least 5 feet (1.5m) from all metal
surfaces. As an alternative, a swim spa may be installed within 5 feet of metal
surfaces if each metal surface is permanently connected by a minimum 8AWG
(8.4mm2) solid copper conductor to the wire connector on the terminal box that is
provided for this purpose.
DANGER – Risk of Electric Shock. Do not permit any electric appliance, such as a
light, telephone, radio, or television, within 5 feet (1.5 m) of a swim spa.
WARNING – To reduce the risk of injury:
a) The water in a swim spa should never exceed 104˚F (40˚C). Water
temperatures between 100˚F (38˚C) and 104˚F (40˚C) are considered safe
for a healthy adult. Lower water temperatures are recommended for young
children and when swim spa use exceeds 10 minutes.

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SAFETY INSTRUCTIONS
IMPORTANT SAFETY
INSTRUCTIONS (CONT.)
b) Since excessive water temperatures have a high potential for causing
fetal damage during the early months of pregnancy, pregnant or possibly
pregnant women should limit water temperatures to 100˚F (38˚C).
c) Before entering a swim spa, the user should measure the water
temperature with an accurate thermometer since the tolerance of water
temperature-regulating devices varies.
d) The use of alcohol, drugs, or medication before or during swim spa use
may lead to unconsciousness with the possibility of drowning.
e) Obese persons and persons with a history of heart disease, low or high
blood pressure, circulatory system problems, or diabetes should consult a
physician before using a swim spa.
f) Persons using medication should consult a physician before using a swim
spa since some medication may induce drowsiness while other medication
may affect heart rate, blood pressure, and circulation.
(For swim spas with a gas heater)
WARNING – Risk of Suffocation. This swim spa is equipped with a gas
heater and is intended for outdoor use only unless proper ventilation can be
provided for an indoor installation.
SAVE THESE INSTRUCTIONS
HYPERTHERMIA
Hyperthermia occurs when the internal temperature of the body reaches a
level several degrees above the normal body temperature of 98.6°F (37˚C).
Prolonged immersion in hot water may induce hyperthermia.
THE SYMPTOMS OF HYPERTHERMIA INCLUDE:
• Dizziness • Fainting • Drowsiness • Lethargy
• Increase in Internal Body Temperature
THE EFFECTS OF HYPERTHERMIA INCLUDE:
Unawareness of Impending Hazard • Failure to Perceive Heat • Failure to
Recognize the Need to Exit Swim Spa • Physical Inability to Exit Swim Spa •
Fetal Damage in Pregnant Women • Unconsciousness Resulting in a Danger
of Drowning

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SAFETY INSTRUCTIONS
IMPORTANT SAFETY
INSTRUCTIONS (CONT.)
DANGER – To reduce the risk of injury to persons, do not remove the suction grate.
Suction through drains and skimmers is powerful when the jets in the swim spa are
in use. Damaged covers can be hazardous to small children and adults with long
hair. Should any part of the body be drawn into these fittings, turn off the
swim
spa immediately. As a precaution, long hair should not be allowed to float in the
swim spa.
WARNING – Install the swim spa so that water can be easily drained out of the
compartment containing electrical components so as not to damage equipment.
When installing the swim spa, make sure to allow for an adequate drainage system
to deal with any overflow water. Please allow for at least 3 feet of clearance
around the perimeter of the swim spa to provide enough room to access for
servicing. Contact your local dealer for their specific requirements.
WARNING – The swim spa should be covered with an approved locking cover when
not in use, to prevent unauthorized entry and injuries.
WARNING – People with infections, sores or the like should not use the swim spa.
Warm and hot water temperatures may allow the growth of infectious bacteria if
not properly disinfected.
CAUTION – Safe temperatures for swimming or aquatic exercise is around 80˚F
(26.7˚C).
CAUTION – Risk of Electrical Shock. Do not leave audio compartment open.
Audio CD controls are not to be operated while inside the swim spa.
CAUTION – Replace components only with identical components.
WARNING – Risk of Electric Shock. Do not connect any auxiliary components (for
example, additional speakers, headphones, additional audio/ video components
etc.) to the system. These units are not provided with an outdoor antenna.
Do not service this product yourself as opening or removing the covers may expose
you to dangerous voltage or other hazards. Refer all servicing to qualified service
personnel.
If the power supply cord(s) are damaged, water is entering the speaker, audio
compartment, or any other component in the electrical equipment compartment
area, the protective shield is showing signs of deterioration, or there are signs of
other potentially hazardous damage to the unit, turn off the circuit breaker from
the wall and refer servicing to qualified personnel.

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SAFETY INSTRUCTIONS
IMPORTANT SAFETY
INSTRUCTIONS (CONT.)
The unit should be subjected to periodic routine maintenance once every quarter to
make sure that the swim spa it is operating properly.
DANGER – Risk of Electric Shock. A green colored terminal or a terminal marked G,
GR, Ground, Grounding or the symbol shown in Figure 14.1 of UL 1563 is located
inside the supply terminal box or compartment. To reduce the risk of electric shock,
this terminal must be connected to the grounding means provided in the electric
supply service panel with a continuous copper wire equivalent in size to the circuit
conductors supplying this equipment.
At least two lugs marked “Bonding Lugs” are provided on the external surface or
on the inside of the supply terminal box or compartment. To reduce the risk of
electric shock, connect the local common bonding grid in the area of the swim spa
to these terminals with an insulated or bare copper conductor not smaller than
8AWG.
All field installed metal components such as rails, ladders, drains, or other similar
hardware within 10 feet (3m) of the swim spa shall be bonded to the equipment
grounding bus with copper conductors not smaller than 8AWG.
SAVE THESE INSTRUCTIONS

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SAFETY INSTRUCTIONS
WARNING: CHILDREN SHOULD NOT USE SWIM SPAS OR HOT TUBS WITHOUT ADULT
SUPERVISION.
AVERTISSEMENT: NE PAS LAISSER LES ENFANTS UTILISER UNE CUVE DE RELAXATION
SANS SURVEILLANCE.
WARNING: DO NOT USE SWIM SPAS OR HOT TUBS UNLESS ALL SUCTION GUARDS ARE
INSTALLED TO PREVENT BODY AND HAIR ENTRAPMENT.
AVERTISSEMENT: POUR ÉVITER QUE LES CHEVEUX OU UNE PARTIE DU CORPS
PUISSENT ÊTRE ASPIRES, NE PAS UTILISER UNE CUVE DE RELAXATION SI LES GRILLES DI PRISE
D’ASPIRATION NE SONT PAS TOUTES EN PLACE.
WARNING: PEOPLE USING MEDICATIONS AND/OR HAVING AN ADVERSE MEDICAL
HISTORY SHOULD CONSULT A PHYSICIAN BEFORE USING A SWIM SPA OR HOT TUB.
AVERTISSEMENT: LES PERSONNES QUI PRENNENT DES MÉDICAMENTS OU ONT
DES PROBLÉMES DE SANTÉ DEVRAIENT CONSULTER UN MÉDECIN AVANT D’UTILISER UNE CUVE
DE RELAXATION.
WARNING: PEOPLE WITH INFECTIOUS DISEASES SHOULD NOT USE A SWIM SPA OR HOT TUB.
AVERTISSEMENT: LES PERSONNES ATTEINTES DE MALADIES INFECTIEUSES NE
DEVRAIENT PAS UTILISER UNE CUVE DE RELAXATION.
WARNING: TO AVOID INJURY EXERCISE CARE WHEN ENTERING OR EXITING THE SWIM
SPA OR HOT TUB.
AVERTISSEMENT: POUR ÉVITER DES BLESSURES, USER DE PRUDENCE EN ENTRANT
DANS UNE CUVE DE RELAXATION ET EN SORTANT.
WARNING: DO NOT USE DRUGS OR ALCOHOL BEFORE OR DURING THE USE OF A SWIM
SPA OR HOT TUB TO AVOID UNCONSCIOUSNESS AND POSSIBLE DROWNING.
AVERTISSEMENT: POUR ÉVITER L’ÉVANOUISSEMENT ET LA NOYADE ÉVENTUELLE, NE
PRENDE NI DROGUE NI ALCOOL AVANT D’UTILISER UNE CUVE DE RELAXATION NI QUAND ON S’Y
TROUVE.
WARNING: PREGNANT OR POSSIBLY PREGNANT WOMEN SHOULD CONSULT A
PHYSICIAN BEFORE USING A SWIM SPA OR HOT TUB.
AVERTISSEMENT: LES FEMMES ENCEINTES, QUE LEUR GROSSESSE SOIT CONFIRMÉE
OU NON, DEVRAIENT CONSULTER UN MÉDECIN AVANT D’UTILISER UNE CUVE DE RELAXATION.
WARNING: WATER TEMPERATURE IN EXCESS OF 38˚C MAY BE INJURIOUS TO YOUR
HEALTH.
AVERTISSEMENT: IL PEUT ÊTRE DANGEREUX POUR LA SANTÉ DE SE PLONGER DANS
DE L’EAU A PLUS DE 38˚C.
WARNING: BEFORE ENTERING THE SWIM SPA OR HOT TUB MEASURE THE WATER
TEMPERATURE WITH AN ACCURATE THERMOMETER.
AVERTISSEMENT: AVANT D’UTILISER UNE CUVE DE RELAXATION MESURER LA
TEMPÉRATURE DE L’EAU À L’AIDE D’UN THERMOMÉTRE PRÉCIS.

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SAFETY INSTRUCTIONS
WARNING: DO NOT USE A SWIM SPA OR HOT TUB IMMEDIATELY FOLLOWING
STRENUOUS EXERCISE.
AVERTISSEMENT: NE PAS UTILISER UNE CUVE DE RELAXATION IMMÉDIATEMENT
APRÉS UN EXERCISE FATIGANT.
WARNING: PROLONGED IMMERSION IN A SWIM SPA OR HOT TUB MAY BE INJUROUS TO
YOUR HEALTH.
AVERTISSEMENT: L’UTILISATION PROLONGÉE D’UNE CUVE DE RELAXATION PEUT
ÊTRE DANGEREUSE POUR LA SANTÉ.
WARNING: DO NOT PERMIT ELECTRIC APPLIANCES (SUCH AS LIGHT, TELEPHONE, RADIO,
OR TELEVISION) WITHIN 1.5 M OF THIS SWIM SPA OR HOT TUB.
AVERTISSEMENT: NE PAS PLACER D’APPAREIL ÉLECTRIQUE (LUMINAIRE, TÉLÉPHONE,
RADIO, TÉLÉVISEUR, ETC) À MOINS DE 1.5 M DE CETTE CUVE DE RELAXATION.
CAUTION: MAINTAIN WATER CHEMISTRY IN ACCORDANCE WITH MANUFACTURER’S
INSTRUCTIONS.
ATTENTION: LA TENEUR DE L’EAU EN MATIÉRES DISSOUTES DOIT ÊTRE CONFORME AUX
DIRECTIVES DU FABRICANT.
Hyperthermia occurs when the internal temperature of the body reaches a level several degrees
above the normal body temperature of 98.6˚F (37˚C). The symptoms of hyperthermia include
drowsiness, lethargy, and an increase in the internal temperature of the body. The effects of
hyperthermia include:
(a) unawareness of impending hazard;
(b) failure to perceive heat;
(c) failure to recognize the need to exit swim spa;
(d) physical inability to exit swim spa;
(e) fetal damage in pregnant women; and
(f) unconsciousness and danger of drowning.
WARNING: THE USE OF ALCOHOL, DRUGS OR MEDICATIONS CAN GREATLY INCREASE
THE RISK OF HYPERTHERMIA.
AVERTISSEMENT: LA CONSOMMATION D’ALCOOL, DE DROGUE OU LES
MÉDICAMENTS AUGMENTE CONSIDÉRABLEMENT LES RISQUES D’HYPERTHERMIE MORTELLE.

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Relax and rest assured that your Master Spas manufactured swim spa has been built with safety in
mind. We manufacture our self-contained swim spas to meet a stringent list of industry standards.
Our jetted swim spas comply with the following industry standards:
• UL 1563 Standard for Electric Spas, Equipment Assemblies and Associated Equipment
• ICC ISPSC International Swimming Pool & Spa Code
• VGB Virginia Graeme Baker Pool and Spa Safety Act (Certified by UL to UL 1563)
• ANSI/APSP-6 Standard for Portable Spas
• ANSI/APSP/ICC-14 Standard for Portable Spa Energy Efficiency
• CEC Title 20 Appliance Efficiency Regulation
• CSA C22.2 No. 218.1 Spas, Hot Tubs and Associated Equipment
• IAPMO/ANSI Z124.7 Prefabricated Plastic Spa Shells
• CE - EN 60335-2-60 Household and Similar Electrical Appliances – Safety: Particular
Requirements for Whirlpool Baths and Whirlpool Spas
• CE - EN 60335-1 Household and Similar Electrical Appliances – Safety: General Requirements
• 206/95/EC EC Low Voltage Directive
• 204/108/EMC Directive
• 93/68/EEC CE Marking Directive
Our propulsion swim spas comply with the following industry standards:
• UL 1563 Standard for Electric Spas, Equipment Assemblies and Associated Equipment
• ICC ISPSC International Swimming Pool & Spa Code
• VGB Virginia Graeme Baker Pool and Spa Safety Act (Certified by UL to UL 1563)
• ANSI/APSP-7 (Propulsion system only Certified by NSF) Standard for Suction Entrapment
Avoidance in Swimming Pools, Wading Pools, Spas, Hot Tubs and Catch Basins
• ANSI/APSP-6 Standard for Portable Spas
• ANSI/APSP/ICC-14 Standard for Portable Spa Energy Efficiency
• CEC Title 20 Appliance Efficiency Regulation
• CSA C22.2 No. 218.1 Spas, Hot Tubs and Associated Equipment
• IAPMO/ANSI Z124.7 Prefabricated Plastic Spa Shells
• CE - EN 60335-2-60 Household and Similar Electrical Appliances – Safety: Particular
Requirements for Whirlpool Baths and Whirlpool Spas
• CE - EN 60335-1 Household and Similar Electrical Appliances – Safety: General Requirements
• 206/95/EC EC Low Voltage Directive
• 204/108/EMC Directive
• 93/68/EEC CE Marking Directive
COMPLIANCE

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VGB SUCTION SAFETY & MAINTENANCE INSTRUCTIONS
VGB 2008:
WARNING
Read and follow all instructions in this manual and on the suction fitting. Failure to follow
instructions can cause severe injury and/or death.
Failure to remove pressure test plugs and/or plugs used in winterization of the spa/swim
spa from the suction outlets can result in an increased potential for suction entrapment.
Suction outlet components have a finite life. The cover/grate should be inspected
frequently and replaced at least every seven years, or if found to be damaged, broken,
cracked, missing, or not securely attached.
If the fitting is missing or broken, replace with a fitting of equivalent rating or higher. Use
of a lower rated suction fitting could result in entrapment of the body which could result
in serious injury including drowning.
Do not use or operate spa/swim spa if this suction fitting is missing, broken or not secured
per instructions. The suction fitting is intended to prevent entrapment of the body. Use of
the spa/swim spa with a missing, broken or improperly secured suction grate may result in
serious personal injury including drowning.
When the spa/swim spa is in operation, suction is created at this fitting. Users of the spa/
swim spa must be instructed not to come in contact with this fitting in such a way as to
block its orifice. If a user of the spa/swim spa blocks this fitting with his/her body, serious
personal injury or drowning may occur.
IMPORTANT SAFETY INSTRUCTIONS
WARNING - SUCTION ENTRAPMENT HAZARD
Suction in suction outlets and/or suction outlet covers which are damaged, broken,
cracked, missing, or unsecured can cause severe injury and/or death due to the
following entrapment hazards:
Hair Entrapment: Hair can become entangled in suction outlet cover.
Limb Entrapment: A limb inserted into an opening of a suction outlet sump/fitting or suction
outlet cover that is damaged, broken, cracked, missing, or not securely attached can result in a
mechanical bind or swelling of the limb.
Body Suction Entrapment: A negative pressure applied to a large portion of the body or limbs can
result in an entrapment.
Evisceration / Disembowelment Entrapment: A negative pressure applied directly to the intestines
through an unprotected suction outlet sump or suction outlet cover which is damaged, broken,
cracked, missing, or unsecured can result in evisceration / disembowelment entrapment.
Mechanical Entrapment: There is potential for jewelry, swimsuit, hair decorations, finger, toe, or
knuckle to be caught in an opening of a suction outlet cover resulting in mechanical entrapment.

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VGB SUCTION SAFETY & MAINTENANCE INSTRUCTIONS
TO REDUCE THE RISK OF ENTRAPMENT HAZARDS:
• Never use a spa/swim spa if any suction outlet component is damaged, broken, cracked, missing,
or not securely attached.
• Replace damaged, broken, cracked, missing, or not securely attached suction outlet components
immediately.
• It is recommended that suction components be inspected at least monthly.
• Replace the suction within 7 years from the installation date. Contact your dealer or local service
center for quoting and scheduling this required maintenance. This is a mandated regulation and
is not part of nor covered by the spa/swim spa warranty.
NOTE: Always review entire safety and maintenance information before beginning maintenance.
Contact Master Spas for Suction Installation information for complete suction assembly
replacement.

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GLOSSARY OF SWIM SPA TERMINOLOGY
Your new swim spa features a variety of jets. All jets, regardless of style, return the water to the
swim spa. Air is mixed with the water by using the air controls (if equipped) creating a vigorous
massage. Water flow is adjusted by simply turning the outer face of most jets. Your swim spa may
have a combination of pulsating, rotating, dual pulsating and directional adjustable jets. Here are
some terms and definitions to help get you acquainted with your swim spa.
1. THERAPY JETS
Located throughout the seats of the swim spa to offer a variety of therapy combinations.
2. NECK JETS (if equipped)
Located above the normal water level to provide massaging action to the back of the neck.
3. SHOULDER JETS (if equipped)
Located above the normal water level to provide massaging action to the shoulders.
4. MASTER BLASTER®FOOT THERAPY JET (if equipped)
Large jet with several fixed nozzles located in the bottom of the swim spa near the floor to
provide excellent massage to the feet.
5. JET DIVERTER VALVE (if equipped)
Located on the top flange of the swim spa, this large valve physically diverts the flow of water
from one group of jets to another. Be sure that no sand or particles are brought into the swim
spa as they will cause the diverter to seize up. It is best to turn the diverter valve only when the
pump is turned off.
6. WATER FEATURE VALVE (if equipped)
Located on the top flange of the swim spa, this smaller valve adjusts water flow to the
waterfalls and/or water features in your swim spa.
NOTE: When the swim spa is not in use, this valve should be turned mostly shut (not completely
shut) to prevent the water features from allowing water to hit the cover while it is closed.
If left mostly open, water may hit the cover and possibly run out of the swim spa causing
water loss.
7. AIR CONTROL VALVE
These smaller valves are located around the top of your swim spa. You may increase or decrease
the force of your jets by opening or closing the air control valves. Each air control valve will
typically function 1 to 2 groups or seats of jets in the swim spa. When not in use, the air
controls should be kept in the closed position as the air being introduced into the water can
tend to cool the water and increase the dissipation rate of sanitizer levels.
8. TOPSIDE CONTROL PANEL
You may safely control swim spa functions from inside or outside your swim spa using the
Topside Control Panel. This panel is used to control the water temperature, pumps, the swim
spa light, automatic filtration cycles and other advanced functions. The digital display will give
you a constant temperature readout and will notify you in case of certain malfunctions. Several
user programmable functions are also available.
9. PERSONAL REMOTE CONTROL (if equipped)
Select swim spa models may have an additional remote which allows the user to control the jet
therapy while remaining in the seat (if applicable). By pressing the control one time, you will
activate the pump. Press again for high speed and again to turn it off.

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GLOSSARY OF SWIM SPA TERMINOLOGY
10. ACCESS PANELS
These are the skirt panels located around all four sides of the swim spa. All of the skirt panels
are removable should service be required. Master Spas recommends at least 3 feet of space
be provided around the swim spa.
11. EQUIPMENT ACCESS PANEL
This is the skirt panel located below the
Topside Control Panel or behind access
panel “A”. This area houses the majority
of components responsible for the swim
spa’s operation. These components
include the pumps, heater, swim spa
control system, ozonator (if equipped),
and LED light system (if equipped). Pump
and equipment placement may vary by
model.
12. FILTER LID
This lid fits over the filter area and weir gate to cover the filters. Remove filter lid to access
filters for maintenance. For models equipped with a telescoping filter housing, simply lift up
to remove this floating assembly to access the filter. At low speed water flow or when the
filtering/heating pump is off, the telescoping part of the filter assembly will float at or near
the waterline. At high speed water flow, it will be drawn downward. See Accessing Filters in
the Regular Maintenance Procedures section for detailed instructions on filter assemblies.
13. WEIR GATE
The weir gate is the horizontal door located in front of the filters that helps keep debris
trapped in the filter area.
14. SWIM SPA CONTROL SYSTEM
This houses the wiring and electrical components necessary to operate the swim spa.
15. SWIM SPA HEATER
This is an electric heater housed in a stainless steel tube. It is thermostatically controlled and
equipped with high-limit temperature safety shut-off sensors.
16. SLICE VALVES
These valves are used by service personnel to shut off water to the
heating system (heater and pump plumbed to the heater) so that
the swim spa water does not need to be drained if the swim spa
requires service to the heating system (varies by model).
NOTE: Slice valves must be completely open during normal operations.
17. MAIN THERAPY PUMP
This produces water flow through the main jets in the swim spa. The first pump may be
operated on two speeds (varies by model). Low speed (if applicable) will produce efficient
water circulation during filtration, heating of the swim spa water, and gentle jet action. High
speed provides maximum jet action. The main pump is controlled by the “Jets” or “Jets 1”
button on the Topside Control Panel.
Slice Valve and Pump Union
2018 H2X Trainer 18 CP
REV. 012019
Panel “B”
Panel “H” Panel “G” Panel “F”
Panel “E”
Panel “A”
Panel “C” Panel “D”

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GLOSSARY OF SWIM SPA TERMINOLOGY
18. SECONDARY THERAPY PUMP (if equipped)
This produces water flow through 1 to 2 groups or seats of jets in the swim spa. The second
pump operates similar to the main pump and is controlled by the “Jets 2” or “Aux” button
on the Topside Control Panel.
19. THIRD THERAPY PUMP (if equipped)
This produces water flow through 1 to 2 groups or seats of jets in the swim spa. This is
controlled by the “Jets 3” button on the Topside Control Panel.
20. CIRCULATION PUMP (if equipped)
This produces water flow through the heater in the swim spa and provides the water flow
necessary to actuate the ozone injector. This energy efficient pump runs 24 hours for efficient
filtration and heating.
21. PUMP UNION
This connects the plumping and pump together. These are used to help relieve possible pump
air locks or for service personnel to easily service the pumps.
22. HEATER UNION
These are used by service personnel to easily service the heater.
23. SWIM SPA LIGHT
The on/off control for the lighting in your swim spa is located on the topside control panel near the
therapy seats.
24. EXERCISE/SWIM JETS (H2X Swim Spas)
These large jets are grouped at the end of your swim spa to offer water flow for exercising
against. A jet diverter valve may control the flow for these jets.
25. SWIM SPA JUNCTION BOX (MP Swim Spa Only)
The internal junction box for connecting your electrical service(s) to the swim spa is located
behind and accessible by removing access panels “B” and “A”.
26. PROPULSION SYSTEM ACCESS (MP Swim Spa Only)
The propulsion control system of the MP Swim Spas is located behind the skirt panel
designated as “E” in the access panels drawing. The propulsion motor, propulsion control
pack, and pulleys for the system are located in this area.
27. PROPULSION SYSTEM CONTROL PANEL (MP Swim Spa & H2X Challenger Models Only)
You may safely control the speed of the propulsion system or variable speed swim jets from
the inside of your swim spa by using the touchscreen control panel mounted in the swim
area. This control panel is used to turn the water flow for exercising on and off and to adjust
the intensity. This control panel may be safely used from inside or outside of the swim spa to
adjust the water flow.

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THE ADVANTAGES OF ECOPUR®CHARGE
*PATENTS PENDING
MADE IN
THE USA
The EcoPur®Charge* is made from Master Spa’s patented filtration fabric. This fabric is wound
tightly into a nautilus master core, creating a catalytic cell. The nautilus fabric cell is encased by a
unique “spring core” that allows for maximum flow and water “charging”. As water
comes in contact with the EcoPur®Charge Master Core, a chemical reaction causes zinc and
copper hydroxides to form in controlled amounts. Like Mother Nature, when controlled releases of
copper and zinc oxides are carried into the filtered water, they kill bacteria and provide hostile
conditions for algae and fungal growth. Using EcoPur®Charge helps reduce the amount of
chemicals needed, therefore safeguarding the swim spa’s plumbing and equipment because pipes
are protected against the corrosive effects of chlorine. EcoPur®Charge Master Core Technology is
another exclusive design by Master Spas.
FEATURES
• Releases Sanitizing Copper & Zinc Oxides
• Reduces Water Soluble Heavy Metals
• Controls Scale, Bacteria and Algae
• Safeguards the Swim Spa’s Plumbing
• Reduces Use of Chemicals
• Helps Prevent Damage to Swimwear

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ECOPUR®CHARGE INSTALLATION
STEPS FOR INSTALLATION
1. Insert EcoPur®Charge in to outer filter.
2. Twist EcoPur®Charge clockwise to lock in place while
holding on to outer filter. When snapped in to locked
position, EcoPur®Charge handle aligns with molded
points on outer filter.
NOTE: EcoPur®Charge should be replaced every 6
months. Initial snap in fit of inner EcoPur®Charge
to outer filter may be tight, especially if both are
new.
Master Spas Outer Filter*
Turn Clockwise to Lock
EcoPur®Charge*
*PATENTS PENDING
MADE IN
THE USA
THE ADVANTAGES OF ECOPUR®CHARGE

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WATER CHEMISTRY TERMS YOU SHOULD KNOW
Before jumping into Water Maintenance, here are some terms to help you.
1. PARTS PER MILLION (PPM):This is a form of measurement used in most pool or swim spa
chemical readings. Best described as any one million like items of equal size and make up, next
to one unlike item, but of equal size. This would be one part per million.
2. TOTAL ALKALINITY: Measures substances in your water such as hydroxides, carbonates and
bicarbonates. When at the proper levels, these elements keep your water from clouding and
growing bacteria, as well as prevent the inner workings of your swim spa from deteriorating or
forming scale. TA also helps to stabilize pH. The higher the TA level (as long as it is within the
recommended range), the less likely the pH is to change. You are looking for a range between
80 - 120 ppm. With low alkalinity, the pH will fluctuate and be harder to control. With high
alkalinity, it becomes extremely difficult to change the pH.
3. PH OR POTENTIAL HYDROGEN: This indicates the acidity or basicity of the water. The goal is to
have a neutral, stable pH to prevent spa damage and unhealthy conditions. Low pH levels can
corrode metals, etch or stain fiberglass or acrylic, cause unsanitary conditions that irritate the
eyes or skin and destruct the total alkalinity of the water. High pH can cause cloudy water,
eye or skin irritation, scale formation and poor chlorine or bromine efficiency. Note that the
chemicals you are using to sanitize and clean your hot tub can also lower or raise the pH level
in the water. You want this range to fall between 7.2 - 7.6 on the scale. Unfortunately, there
are lots of variables to preventing high pH in your swim spa.
4. SHOCKING: By shocking the water in your swim spa you remove organic compounds from the
water, kill bacteria, remove bromamines or chloramines and reactivate the bromides in the
swim spa for cleaner water. You should shock your water once a week, after heavy bather
use or any time free chlorine levels test lower than total chlorine levels. To do this, either add
oxidizer/non-chlorine shock to burn off the chloramines or add extra chlorine to raise the
chlorine level above 8 ppm. Oxidizer/non-chlorine shock acts by releasing oxygen in the water,
which serves a similar function as chlorine. An advantage to using this type of shock is that
the water is safe to enter after 15 minutes of the application and excessive sanitizer (chlorine)
levels do not occur. However, an oxidizer/non-chlorine shock doesn’t disinfect the water for
bacteria. If you use chlorine to shock, you must wait until the total chlorine reading is below
5 ppm.
5. SEQUESTERING: This can be defined as the ability to form a chemical complex which remains
in solution, despite the presence of a precipitating agent (i.e. calcium and metals). If the
minerals and metals in water are not sequestered, they can cause a reaction, turning the water
brown, red, orange or green depending on the minerals and metals present in your water. It
is important to add a sequestering agent when adding water to your swim spa and even on
a regular basis (if bottle instructions recommend doing so). Common names for sequestering
chemicals are: minquest, stain and scale control, metal-x, spa defender, spa metal gone, etc.
6. FILTRATION: Filters are necessary to remove particles of dust, dirt, algae, etc. that are
continuously entering the water. If the swim spa is not operated long enough each day for the
filter to do a proper job, this puts a burden on the chemicals, causing extra expense. Filtration
time will depend on the water capacity, pump and filter size and, of course, bather load.
Spare filter cartridges should be kept on hand to make it easy to frequently clean the cartridge
without the need for a long shut down. This will also allow the cartridge to dry out between
usages, which will increase the cartridge life span as much as twice. Replace the cartridge
when the pleats begin to deteriorate. Cartridge cleaning should be done a minimum of once a
month. More often with a heavy bather load. See Cleaning Your Filter Elements in the Regular
Maintenance section.