Hayward Pool Products PRO Series User manual

SAVE THIS INSTRUCTION MANUAL
OWNER’S MANUAL
INSTALLATION, OPERATION & PARTS
MODELS S210S, S244S
PRO™SERIES HIGH RATE SAND FILTERS
Basic safety precautions should always be followed, including the following: Failure to follow instructions can cause severe
injury and/or death.
This is the safety-alert symbol. When you see this symbol on your equipment or in this manual, look for one of the
following signal words and be alert to the potential for personal injury.
WARNING warns about hazards that could cause serious personal injury, death or major property damage and if
ignored presents a potential hazard.
CAUTION warns about hazards that will or can cause minor or moderate personal injury and/or property damage
and if ignored presents a potential hazard. It can also make consumers aware of actions that are unpredictable and unsafe.
The NOTICE label indicates special instructions that are important but not related to hazards.
Use only High Rate Sand No. 20 Silica Sand (.45mm - .55mm)
HAYWARD POOL PRODUCTS, INC.
620 Division Street Elizabeth, NJ 07207 Tel: [phone]
WWW.HAYWARDPOOL.COM
IS210S-06
Rev B

Page 2 of 8 MODEL S210S, S244S IS210S-06 Rev B
WWW.HAYWARDPOOL.COM USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
- WARNING - Read and follow all instructions in this owner’s manual and on the equipment. Failure to follow
instructions can cause severe injury and/or death.
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 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 - 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.
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.
WARNING - To Reduce the risk of Entrapment Hazards:
oWhen outlets are small enough to be blocked by a person, a minimum of two functioning suction outlets per pump must be installed.
Suction outlets in the same plane (i.e. floor or wall), must be installed a minimum of three feet (3’) [1 meter] apart, as measured from
near point to near point.
oDual suction fittings shall be placed in such locations and distances to avoid “dual blockage” by a user.
oDual suction fittings shall not be located on seating areas or on the backrest for such seating areas.
oThe maximum system flow rate shall not exceed the flow rating of as listed on Table 2.
oNever use Pool or Spa if any suction outlet component is damaged, broken, cracked, missing, or not securely attached.
oReplace damaged, broken, cracked, missing, or not securely attached suction outlet components immediately.
oIn addition two or more suction outlets per pump installed in accordance with latest NSPI, IAF Standards and CPSC guidelines, follow all National,
State, and Local codes applicable.
oInstallation of a vacuum release or vent system, which relieves entrapping suction, is recommended.
WARNING –Failure to remove pressure test plugs and/or plugs used in winterization of the pool/spa from the suction
outlets can result in an increase potential for suction entrapment as described above.
WARNING – Failure to keep suction outlet components clear of debris, such as leaves, dirt, hair, paper and other material
can result in an increase potential for suction entrapment as described above.
WARNING – Suction outlet components have a finite life, the cover/grate should be inspected frequently and replaced at
least every ten years or if found to be damaged, broken, cracked, missing, or not securely attached.
CAUTION – Components such as the filtration system, pumps and heater must be positioned so as to prevent their being
used as means of access to the pool by young children.
WARNING – Never operate or test the circulation system at more than 40 PSI.
CAUTION – All electrical wiring MUST be performed by a qualified professional, and MUST conform to local codes and
regulations.
WARNING – Never change the filter control valve position while the pump is running.
WARNING – Hazardous Pressure. Pool and spa water circulation systems operate under hazardous pressure during start
up, normal operation, and after pump shut off. Stand clear of circulation system equipment during pump start up. Failure to follow
safety and operation instructions could result in violent separation of the pump housing and cover, and/or filter housing and clamp due to
pressure in the system, which could cause property damage, severe personal injury, or death. Before servicing pool and spa water
circulation system, all system and pump controls must be in off position and filter manual air relief valve must be in open position. Before starting
system pump, all system valves must be set in a position to allow system water to return back to the pool. Do not change filter control valve position
while system pump is running. Before starting system pump, fully open filter manual air relief valve. Do not close filter manual air relief valve until a
steady stream of water (not air or air and water) is discharged.
WARNING –Separation Hazard. Failure to follow safety and operation instructions could result in violent separation of pump
and/or filter components. Strainer cover must be properly secured to pump housing with strainer cover lock ring. Before servicing pool and
spa circulation system, the filter’s manual air relief valve must be in open position. Do not operate pool and spa circulation system if a
system component is not assembled properly, damaged, or missing. Do not operate pool and spa circulation system unless filter manual air
relief valve body is in locked position in filter upper body.

Page 3 of 8 MODEL S210S, S244S IS210S-06 Rev B
WWW.HAYWARDPOOL.COM USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
WARNING – Electrical Ground motor before connecting to electrical power supply. Failure to ground pump motor can cause
serious or fatal electrical shock hazard.
WARNING – Do NOT ground to a gas supply line.
WARNING – To avoid dangerous or fatal electrical shock, turn OFF power to motor before working on electrical connections.
WARNING – Failure to bond pump to pool structure will increase risk for electrocution and could result in injury or death. To reduce the risk
of electric shock, see installation instructions and consult a professional electrician on how to bond pump. Also, contact a licensed electrician for
information on local electrical codes for bonding requirements.
Your Hayward Pro Series high-rate sand filter is a high
performance, totally corrosion-proof filter that blends superior
flow characteristics and features with ease of operation. It
represents the very latest in high-rate sand filter technology.
It is virtually foolproof in design and operation and when
installed, operated and maintained according to instructions,
your filter will produce clear, sparkling water with only the
least attention and care.
HOW IT WORKS
Your filter uses special filter sand to remove dirt particles
from the water. Filter sand is loaded into the filter tank and
functions as the permanent dirt removing media. The pool
water, which contains suspended dirt particles, is pumped
through your piping system and is automatically directed by
the patented filter control valve to the top of the filter tank. As
the pool water is pumped through the filter sand, dirt particles
are trapped by the sand bed, and filtered out. The cleaned
pool water is returned from the bottom of the filter tank,
through the control valve and back to the pool through the
piping system. This entire sequence is continuous and
automatic and provides for total recirculation of pool water
through your filter and piping system.
After a period of time, the accumulated dirt in the filter causes
a resistance to flow, and the flow diminishes. This means it is
time to clean (backwash) your filter. With the control valve in
the backwash position, the water flow is automatically
reversed through the filter so that it is directed to the bottom
of the tank, up through the sand, flushing the previously
trapped dirt and debris out the waste line. Once the filter is
backwashed (cleaned) of dirt, the control valve is manually
resequenced to Rinse, and then Filter, to resume normal
filtering.
INSTALLATION
Only simple tools (screwdriver and wrenches), plus
Teflon tape manufactured for plastic adapters, are
required to install and/or service the filter.
1. The filter system should be installed, not more than
6 feet above pool water level, on a level concrete
slab, very firm ground, or equivalent, as
recommended by your pool dealer. Position the filter
so that the piping connections, control valve and
winter drain are convenient and accessible for
operation, service and winterizing. Assemble Vari-
Flo filter control valve to filter. Align the two (2) valve
pipe connections, with 0-rings in place, with the two
openings in the side of the filter tank and press in
firmly. Secure the assembly to the tank connections
with the two bulkhead locknuts.
Do not overtighten.
3. Assemble pump and pump mounting base (if supplied) to
the filter according to instructions packed with the base.
4. Loading sand media. Filter sand media is loaded through the
top opening of the filter.
a. Remove the top diffuser from the internal diffuser
elbow pipe and place flexible, automatic air relief tube
to the side, out of the way, inside the tank.
b. Cap the internal diffuser elbow pipe with the sand
shield provided to prevent sand from entering it.
c. It is good practice to fill tank approximately 1/2 way
with water to provide a cushioning effect when the filter
sand is poured in. This helps protect the under-drain
laterals from excessive shock. (Be sure the drain cap
is securely in place on drain pipe.)
Note: Check to confirm all laterals are in the down
position before loading with sand. (See Figure A on
Page 5.)
d. Carefully pour in correct amount and grade of filter
sand, as specified. Sand surface should be leveled and
should come to about 6 “ from the top of the filter tank.
Use no more than the recommended amount of sand.
e. Remove the sand shield from internal diffuser elbow
pipe.
f. Replace diffuser on internal diffuser elbow pipe,
positioning automatic air relief tube through the hole
provided in the diffuser.

Page 4 of 8 MODEL S210S, S244S IS210S-06 Rev B
WWW.HAYWARDPOOL.COM USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
g. Wipe filter flange clean.
h. Insert top closure dome (with flange 0-ring in place)
into the tank neck. Place clamp around dome flange
and tank flange and tighten with screwdriver, tapping
around clamp with screwdriver handle to help seat
flange clamp.
Do not overtighten.
5. Connect pump to control valve opening marked PUMP
according to instructions. Make return to pool pipe
connection to control valve opening marked RETURN and
complete other necessary plumbing connections, suction
lines to pump, waste, etc.
6. Make electrical connections to pump per pump instructions.
7. To prevent water leakage, be sure drain cap is securely in
place and all pipe connections are tight.
INITIAL START-UP OF FILTER
1. Be sure correct amount of filter sand media is in tank and
that all connections have been made and are secure.
IMPORTANT: To prevent unnecessary strain on piping
system and valving, always shut off pump before
switching Filter Control Valve positions.
2. Depress Vari-Flo control valve handle and
rotate to BACKWASH* position. (To prevent
damage to control valve seat, always depress
handle before turning.)
3. Prime and start pump according to pump
instructions. (be sure all suction and return lines
are open), allowing the filter tank to fill with water.
WARNING –All suction and discharge
valves must be open when starting the system.
Failure to do so could cause severe personal
injury and/or property damage.
4. Once water flow is steady out the waste line, run the pump
for at least 2 minutes. This initial backwashing of the filter is
recommended to remove any impurities or fine sand
particles in the sand media.
5. Turn pump off and set valve to RINSE position. Start
pump and operate until water in sight glass is clear—about
1/2 to 1 minute. Turn pump off, set valve to FILTER
position and restart pump. Your filter is now operating in
the normal filter mode, filtering particles from the pool
water.
6. Adjust pool suction and return valves to achieve desired
flow. Check system and filter for water leaks and tighten
connections, bolts, nuts, as required.
7. Note the initial pressure gauge reading when the filter is
clean. (It will vary from pool to pool depending upon the
pump and general piping system.) As the filter removes dirt
and impurities from the pool water, the accumulation in the
filter will cause the pressure to rise and flow to diminish.
When the pressure gauge reading is 6-8 PSI (0.41-0.55
BAR) higher than the initial "clean" pressure you noted, it is
time to backwash (clean) the filter (see BACKWASH under
Filter Control Valve Functions).
NOTE: During initial clean-up of the pool water it may be
necessary to backwash frequently due to the unusually
heavy initial dirt load in the water.
To prevent damage to the pump and filter and for proper
operation of the system, clean pump strainer and skimmer
baskets regularly.
FILTER CONTROL VALVE FUNCTIONS
FILTER—Set valve to FILTER for normal filtering. Also use for
regular vacuuming.
BACKWASH—For cleaning filter. When filter pressure gauge
rises 6-8 PSI (0.41-0.55 BAR) above start-up (clean pressure):
Stop the pump, set valve to BACKWASH. Start pump and
backwash approximately 2 minutes or less depending on dirt
accumulation until water in sight glass is clear. Proceed to
RINSE.
RINSE—After backwashing, with pump off, set valve to RINSE.
Start pump and operate for about 1/2 to 1 minute. This ensures
that all dirty water from backwashing is rinsed out to the filter to
waste, preventing possible return to the pool. Stop pump, set
valve to FILTER, and start pump for normal filtering.
WASTE—To bypass filter for draining or lowering water level
and for vacuuming heavy debris directly to waste.
RECIRCULATE—Water is recirculated through the pool
system, bypassing the filter.
CLOSED—Shuts off flow from pump to filter.
VACUUMING—Vacuuming can be performed directly into the
filter. When vacuuming heavy debris loads, set valve to
WASTE position to bypass the filter and vacuum directly out to
waste.
WINTERIZING
1. Completely drain tank by unscrewing drain cap at base of
filter tank. Leave cap off during winter.
2. Depress Vari-Flo control valve handle and rotate so as to set
pointer on valve top between any two positions. This will allow
water to drain from the valve. Leave valve in this "inactive"
position.
3. Drain and winterize pump according to pump instructions.
SERVICE & REPAIRS
Consult your local authorized Hayward dealer or service center.
No returns may be made directly to the factory without the
expressed authorization of Hayward Pool Products, Inc.
PLEASE REALIZE:
Pure, clear swimming pool water is a combination of two
factors—adequate filtration and proper water chemistry
balance. One without the other will not give the clean
water you desire.
Your filter system is designed for continuous operation.
However, this is not necessary for most swimming pools.
You can determine your filter operation schedule based
on your pool size and usage. Be sure to operate your
filtration system long enough each day to obtain at least
one complete turnover of your pool water.
To properly sanitize your pool, maintain a free chlorine
level of 1 to 3 ppm and a pH range of 7.2 to 7.6.
Insufficient chlorine or an out of balance pH level will
permit algae and bacteria to grow in your pool and make
it difficult for your filter to properly clean the pool water.
*NOTE: For new concrete or gunite pools, or where there is a large amount of
plaster dust or debris—start filter in FILTER position (not BACKWASH) to
prevent clogging of underdrain laterals.

Page 6 of 8 MODEL S210S, S240T IS210S-06 Rev B
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PROBLEM SOLVING LIST
LOW WATER FLOW SHORT FILTER CYCLES
POOL WATER WON'T CLEAR UP
REMEDY 1. Check skimmer and pump 1. Check for algae in pool and 1. Check chlorine, pH and total
strainer baskets for debris.
2. Check for restrictions in
intake and discharge lines.
3. Check for air leak in intake
line (indicated by bubbles
returning to pool).
4. Backwash filter.
superchlorinate as required.
2. Be sure chlorine and pH
levels are in proper range
(adjust as required).
3. Check surface of filter sand
for crusting or caking (remove 1 "
of sand if necessary).
alkalinity levels and adjust
as required.
2. Be sure flow rate through
filter is sufficient.
3. Operate filter for longer periods.
4. Be sure Vari-Flo valve is set on
"Filter" position.
POOL CHEMISTRY GUIDELINES
ACTION REQUIRED TO CORRECT POOL CHEMISTRY
SUGGESTED POOL CHEMISTRY LEVELS
TO RAISE TO LOWER
pH 7.2 to 7.6 Add Soda Ash Add Muriatic Acid or Sodium Bisulphate
TOTAL ALKALINITY 100 to 130 ppm Add Sodium Bicarbonate Add Muriatic Acid
CHLORINE (UNSTABILIZED) 0.3 to 1.0 ppm Add Chlorine Chemical No action - chlorine will naturally dissipate
CHLORINE (STABILIZED) 1.0 to 3.0 ppm Add Chlorine Chemical No action - chlorine will naturally dissipate
CHLORINE STABILIZER 40 to 70 ppm
(Cyanuric Acid) Add Stabilizer Dilution - partially drain & refill pool with water
that has not been treated with Cyanuric Acid.
DATE OF INSTALLATION ____________________
PURCHASED FROM _______________________
MODEL _______________ SERIAL NUMBER _______________________
▲Retain this Warranty Certificate in a safe and convenient location for your records.
MAXIMUM RECOMMENDED SYSTEM FLOW RATE BY PIPE SIZE
Pipe Size
[mm]
Flow rate
GPM [Liter/Min]
Pipe Size
[mm]
Flow rate
GPM [Liter/Min]
Pipe Size
[mm]
Flow rate
GPM [Liter/Min]
1”
[32]
20
[75]
1 ½”
[50]
45
[170]
2 ½”
[75]
110
[415]
1 ¼”
[40]
30
[110]
2”
[63]
80
[300]
3”
[90]
160
[600]
TABLE 2
PRODUCT REGISTRATION
(
R
e
tain F
o
r Y
ou
r R
eco
r
ds)

SAVE THIS INSTRUCTION MANUAL
OWNER’S MANUAL
INSTALLATION, OPERATION & PARTS
MODELS S310S
PRO™SERIES HIGH RATE SAND FILTERS
Basic safety precautions should always be followed, including the following: Failure to follow instructions can cause severe
injury and/or death.
This is the safety-alert symbol. When you see this symbol on your equipment or in this manual, look for one of the
following signal words and be alert to the potential for personal injury.
WARNING warns about hazards that could cause serious personal injury, death or major property damage and if
ignored presents a potential hazard.
CAUTION warns about hazards that will or can cause minor or moderate personal injury and/or property damage
and if ignored presents a potential hazard. It can also make consumers aware of actions that are unpredictable and unsafe.
The NOTICE label indicates special instructions that are important but not related to hazards.
Use only High Rate Sand No. 20 Silica Sand (.45mm - .55mm)
HAYWARD POOL PRODUCTS, INC.
620 Division Street Elizabeth, NJ 07207 Tel: [phone]
WWW.HAYWARDPOOL.COM
IS310S
Rev B

Page 2 of 8 MODEL S310S IS310S Rev B
WWW.HAYWARDPOOL.COM USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
- WARNING - Read and follow all instructions in this owner’s manual and on the equipment. Failure to follow
instructions can cause severe injury and/or death.
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 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 - 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.
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.
WARNING - To Reduce the risk of Entrapment Hazards:
o When outlets are small enough to be blocked by a person, a minimum of two functioning suction outlets per pump must be installed.
Suction outlets in the same plane (i.e. floor or wall), must be installed a minimum of three feet (3’) [1 meter] apart, as measured from
near point to near point.
o Dual suction fittings shall be placed in such locations and distances to avoid “dual blockage” by a user.
o Dual suction fittings shall not be located on seating areas or on the backrest for such seating areas.
o The maximum system flow rate shall not exceed the flow rating of as listed on Table 2.
o Never use Pool or Spa if any suction outlet component is damaged, broken, cracked, missing, or not securely attached.
o Replace damaged, broken, cracked, missing, or not securely attached suction outlet components immediately.
o In addition two or more suction outlets per pump installed in accordance with latest NSPI, IAF Standards and CPSC guidelines, follow all National,
State, and Local codes applicable.
o Installation of a vacuum release or vent system, which relieves entrapping suction, is recommended.
WARNING –Failure to remove pressure test plugs and/or plugs used in winterization of the pool/spa from the suction
outlets can result in an increase potential for suction entrapment as described above.
WARNING – Failure to keep suction outlet components clear of debris, such as leaves, dirt, hair, paper and other material
can result in an increase potential for suction entrapment as described above.
WARNING – Suction outlet components have a finite life, the cover/grate should be inspected frequently and replaced at
least every ten years or if found to be damaged, broken, cracked, missing, or not securely attached.
CAUTION – Components such as the filtration system, pumps and heater must be positioned so as to prevent their being
used as means of access to the pool by young children.
WARNING – Never operate or test the circulation system at more than 40 PSI.
CAUTION – All electrical wiring MUST be performed by a qualified professional, and MUST conform to local codes and
regulations.
WARNING – Never change the filter control valve position while the pump is running.
WARNING – Hazardous Pressure. Pool and spa water circulation systems operate under hazardous pressure during start
up, normal operation, and after pump shut off. Stand clear of circulation system equipment during pump start up. Failure to follow
safety and operation instructions could result in violent separation of the pump housing and cover, and/or filter housing and clamp due to
pressure in the system, which could cause property damage, severe personal injury, or death. Before servicing pool and spa water
circulation system, all system and pump controls must be in off position and filter manual air relief valve must be in open position. Before starting
system pump, all system valves must be set in a position to allow system water to return back to the pool. Do not change filter control valve position
while system pump is running. Before starting system pump, fully open filter manual air relief valve. Do not close filter manual air relief valve until a
steady stream of water (not air or air and water) is discharged.
WARNING –Separation Hazard. Failure to follow safety and operation instructions could result in violent separation of pump
and/or filter components. Strainer cover must be properly secured to pump housing with strainer cover lock ring. Before servicing pool and
spa circulation system, the filter’s manual air relief valve must be in open position. Do not operate pool and spa circulation system if a
system component is not assembled properly, damaged, or missing. Do not operate pool and spa circulation system unless filter manual air
relief valve body is in locked position in filter upper body.

Page 3 of 8 MODEL S310S IS310S Rev B
WWW.HAYWARDPOOL.COM USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
WARNING – Electrical Ground motor before connecting to electrical power supply. Failure to ground pump motor can cause
serious or fatal electrical shock hazard.
WARNING – Do NOT ground to a gas supply line.
WARNING – To avoid dangerous or fatal electrical shock, turn OFF power to motor before working on electrical connections.
WARNING – Failure to bond pump to pool structure will increase risk for electrocution and could result in injury or death. To reduce the risk
of electric shock, see installation instructions and consult a professional electrician on how to bond pump. Also, contact a licensed electrician for
information on local electrical codes for bonding requirements.
Your Hayward Pro Series high-rate sand filter is a high
performance, totally corrosion-proof filter that blends superior
flow characteristics and features with ease of operation. It
represents the very latest in high-rate sand filter technology.
It is virtually foolproof in design and operation and when
installed, operated and maintained according to instructions,
your filter will produce clear, sparkling water with only the
least attention and care.
HOW IT WORKS
Your filter uses special filter sand to remove dirt particles
from the water. Filter sand is loaded into the filter tank and
functions as the permanent dirt removing media. The pool
water, which contains suspended dirt particles, is pumped
through your piping system and is automatically directed by
the patented filter control valve to the top of the filter tank. As
the pool water is pumped through the filter sand, dirt particles
are trapped by the sand bed, and filtered out. The cleaned
pool water is returned from the bottom of the filter tank,
through the control valve and back to the pool through the
piping system. This entire sequence is continuous and
automatic and provides for total recirculation of pool water
through your filter and piping system.
After a period of time, the accumulated dirt in the filter causes
a resistance to flow, and the flow diminishes. This means it is
time to clean (backwash) your filter. With the control valve in
the backwash position, the water flow is automatically
reversed through the filter so that it is directed to the bottom
of the tank, up through the sand, flushing the previously
trapped dirt and debris out the waste line. Once the filter is
backwashed (cleaned) of dirt, the control valve is manually
resequenced to Rinse, and then Filter, to resume normal
filtering.
INSTALLATION
Only simple tools (screwdriver and wrenches), plus
Teflon tape manufactured for plastic adapters, are
required to install and/or service the filter.
1. The filter system should be installed, not more than
6 feet above pool water level, on a level concrete
slab, very firm ground, or equivalent, as
recommended by your pool dealer. Position the filter
so that the piping connections, control valve and
winter drain are convenient and accessible for
operation, service and winterizing. Assemble Vari-
Flo filter control valve to filter. Align the two (2) valve
pipe connections, with 0-rings in place, with the two
openings in the side of the filter tank and press in
firmly. Secure the assembly to the tank connections
with the two bulkhead locknuts.
Do not overtighten.
3. Assemble pump and pump mounting base (if supplied) to
the filter according to instructions packed with the base.
4. Loading sand media. Filter sand media is loaded through the
top opening of the filter.
a. Remove the top diffuser from the internal diffuser
elbow pipe and place flexible, automatic air relief tube
to the side, out of the way, inside the tank.
b. Cap the internal diffuser elbow pipe with the sand
shield provided to prevent sand from entering it.
c. It is good practice to fill tank approximately 1/2 way
with water to provide a cushioning effect when the filter
sand is poured in. This helps protect the under-drain
laterals from excessive shock. (Be sure the drain cap
is securely in place on drain pipe.)
Note: Check to confirm all laterals are in the down
position before loading with sand. (See Figure A on
Page 5.)
d. Carefully pour in correct amount and grade of filter
sand, as specified. Sand surface should be leveled and
should come to about 6 “ from the top of the filter tank.
Use no more than the recommended amount of sand.
e. Remove the sand shield from internal diffuser elbow
pipe.
f. Replace diffuser on internal diffuser elbow pipe,
positioning automatic air relief tube through the hole
provided in the diffuser.

Page 4 of 8 MODEL S310S IS310S Rev B
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g. Wipe filter flange clean.
h. Insert top closure dome (with flange 0-ring in place)
into the tank neck. Place clamp around dome flange
and tank flange and tighten with screwdriver, tapping
around clamp with screwdriver handle to help seat
flange clamp. Do not overtighten.
5. Connect pump to control valve opening marked PUMP
according to instructions. Make return to pool pipe
connection to control valve opening marked RETURN and
complete other necessary plumbing connections, suction
lines to pump, waste, etc.
6. Make electrical connections to pump per pump instructions.
7. To prevent water leakage, be sure drain cap is securely in
place and all pipe connections are tight.
INITIAL START-UP OF FILTER
1. Be sure correct amount of filter sand media is in tank and
that all connections have been made and are secure.
IMPORTANT: To prevent unnecessary strain on piping
system and valving, always shut off pump before
switching Filter Control Valve positions.
2. Depress Vari-Flo control valve handle and
rotate to BACKWASH* position. (To prevent
damage to control valve seat, always depress
handle before turning.)
3. Prime and start pump according to pump
instructions. (be sure all suction and return lines
are open), allowing the filter tank to fill with water.
WARNING –All suction and discharge
valves must be open when starting the system.
Failure to do so could cause severe personal
injury and/or property damage.
4. Once water flow is steady out the waste line, run the pump
for at least 2 minutes. This initial backwashing of the filter is
recommended to remove any impurities or fine sand
particles in the sand media.
5. Turn pump off and set valve to RINSE position. Start
pump and operate until water in sight glass is clear—about
1/2 to 1 minute. Turn pump off, set valve to FILTER
position and restart pump. Your filter is now operating in
the normal filter mode, filtering particles from the pool
water.
6. Adjust pool suction and return valves to achieve desired
flow. Check system and filter for water leaks and tighten
connections, bolts, nuts, as required.
7. Note the initial pressure gauge reading when the filter is
clean. (It will vary from pool to pool depending upon the
pump and general piping system.) As the filter removes dirt
and impurities from the pool water, the accumulation in the
filter will cause the pressure to rise and flow to diminish.
When the pressure gauge reading is 6-8 PSI (0.41-0.55
BAR) higher than the initial "clean" pressure you noted, it is
time to backwash (clean) the filter (see BACKWASH under
Filter Control Valve Functions).
NOTE: During initial clean-up of the pool water it may be
necessary to backwash frequently due to the unusually
heavy initial dirt load in the water.
To prevent damage to the pump and filter and for proper
operation of the system, clean pump strainer and skimmer
baskets regularly.
FILTER CONTROL VALVE FUNCTIONS
FILTER—Set valve to FILTER for normal filtering. Also use for
regular vacuuming.
BACKWASH—For cleaning filter. When filter pressure gauge
rises 8-10PSI (0.55-0.69 BAR) above start-up (clean pressure):
Stop the pump, set valve to BACKWASH. Start pump and
backwash approximately 2 minutes or less depending on dirt
accumulation until water in sight glass is clear. Proceed to
RINSE.
RINSE—After backwashing, with pump off, set valve to RINSE.
Start pump and operate for about 1/2 to 1 minute. This ensures
that all dirty water from backwashing is rinsed out to the filter to
waste, preventing possible return to the pool. Stop pump, set
valve to FILTER, and start pump for normal filtering.
WASTE—To bypass filter for draining or lowering water level
and for vacuuming heavy debris directly to waste.
RECIRCULATE—Water is recirculated through the pool
system, bypassing the filter.
CLOSED—Shuts off flow from pump to filter.
VACUUMING—Vacuuming can be performed directly into the
filter. When vacuuming heavy debris loads, set valve to
WASTE position to bypass the filter and vacuum directly out to
waste.
WINTERIZING
1. Completely drain tank by unscrewing drain cap at base of
filter tank. Leave cap off during winter.
2. Depress Vari-Flo control valve handle and rotate so as to set
pointer on valve top between any two positions. This will allow
water to drain from the valve. Leave valve in this "inactive"
position.
3. Drain and winterize pump according to pump instructions.
SERVICE & REPAIRS
Consult your local authorized Hayward dealer or service center.
No returns may be made directly to the factory without the
expressed authorization of Hayward Pool Products, Inc.
PLEASE REALIZE:
Pure, clear swimming pool water is a combination of two
factors—adequate filtration and proper water chemistry
balance. One without the other will not give the clean
water you desire.
Your filter system is designed for continuous operation.
However, this is not necessary for most swimming pools.
You can determine your filter operation schedule based
on your pool size and usage. Be sure to operate your
filtration system long enough each day to obtain at least
one complete turnover of your pool water.
To properly sanitize your pool, maintain a free chlorine
level of 1 to 3 ppm and a pH range of 7.2 to 7.6.
Insufficient chlorine or an out of balance pH level will
permit algae and bacteria to grow in your pool and make
it difficult for your filter to properly clean the pool water.
*NOTE: For new concrete or gunite pools, or where there is a large amount of
plaster dust or debris—start filter in FILTER position (not BACKWASH) to
prevent clogging of underdrain laterals.

Page 6 of 8 MODEL S310S IS310S Rev B
WWW.HAYWARDPOOL.COM USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
PROBLEM SOLVING LIST
LOW WATER FLOW SHORT FILTER CYCLES
POOL WATER WON'T CLEAR UP
REMEDY 1. Check skimmer and pump 1. Check for algae in pool and 1. Check chlorine, pH and total
strainer baskets for debris.
2. Check for restrictions in
intake and discharge lines.
3. Check for air leak in intake
line (indicated by bubbles
returning to pool).
4. Backwash filter.
superchlorinate as required.
2. Be sure chlorine and pH
levels are in proper range
(adjust as required).
3. Check surface of filter sand
for crusting or caking (remove 1 "
of sand if necessary).
alkalinity levels and adjust
as required.
2. Be sure flow rate through
filter is sufficient.
3. Operate filter for longer periods.
4. Be sure Vari-Flo valve is set on
"Filter" position.
POOL CHEMISTRY GUIDELINES
ACTION REQUIRED TO CORRECT POOL CHEMISTRY
SUGGESTED POOL CHEMISTRY LEVELS
TO RAISE TO LOWER
pH 7.2 to 7.6 Add Soda Ash Add Muriatic Acid or Sodium Bisulphate
TOTAL ALKALINITY 100 to 130 ppm Add Sodium Bicarbonate Add Muriatic Acid
CHLORINE (UNSTABILIZED) 0.3 to 1.0 ppm Add Chlorine Chemical No action - chlorine will naturally dissipate
CHLORINE (STABILIZED) 1.0 to 3.0 ppm Add Chlorine Chemical No action - chlorine will naturally dissipate
CHLORINE STABILIZER 40 to 70 ppm
(Cyanuric Acid) Add Stabilizer Dilution - partially drain & refill pool with water
that has not been treated with Cyanuric Acid.
DATE OF INSTALLATION ____________________
PURCHASED FROM _______________________
MODEL _______________ SERIAL NUMBER _______________________
▲Retain this Warranty Certificate in a safe and convenient location for your records.
MAXIMUM RECOMMENDED SYSTEM FLOW RATE BY PIPE SIZE
Pipe Size
[mm]
Flow rate
GPM [Liter/Min]
Pipe Size
[mm]
Flow rate
GPM [Liter/Min]
Pipe Size
[mm]
Flow rate
GPM [Liter/Min]
1”
[32]
20
[75]
1 ½”
[50]
45
[170]
2 ½”
[75]
110
[415]
1 ¼”
[40]
30
[110]
2”
[63]
80
[300]
3”
[90]
160
[600]
TABLE 2
PRODUCT REGISTRATION
(
R
e
tain F
o
r Y
ou
r R
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ds)