Miura MW-35U User manual

OPERATION
MANUAL
System Integrated
Water Softener
MW-35U
MW-65U
MW-65U
MW-100U
MW-150U
MW-250U
MW-400U
MW-600U
MW-1000U
(America Product)
Manual Code No. S827-089-020B
This document was formulated in Japan.
Comply with the regulations and standards of
the country of use regarding installation and
usage.
The specifications of products and components
may vary with country of use and the site
situation.
INFORMATION IN THIS MANUAL MAY BE
CHANGED WITHOUT NOTICE.

Release date: Feb. 2022

Important Safety Information
i
Important Safety Information
Before using the MW model system integrated water softener, ensure that this operation manual has
been read and fully understood; furthermore, the instructions given herein should be strictly
observed during operation.
The MW model system integrated water softener contains moving parts that may become entangled
(with a part of the human body) and high voltage sections that could cause electric shock. Failure to
use this system integrated water softener in the appropriate manner can, therefore, result in death,
injury, the outbreak of fire, and other serious accidents.
In order to ensure that tasks undertaken during operation and maintenance of the MW model system
integrated water softener can be completed safely, it is critical that the locations of all dangerous and
hazardous parts of this equipment be confirmed in advance. Here at MIURA, it is practically
impossible to anticipate all potentially dangerous situations, and therefore, this Operation Manual
deals only with known hazards. A higher level of safety can be achieved by careful observation of the
warnings and instructions set forth herein.
Safety-related warnings are classified into the following three levels, and notification of these
warnings is provided both within this Operation Manual and by the use of warning labels on the MW
model system integrated water softener itself.
Indicates an imminently dangerous situation which leads to serious
injury or death to the user, if the product is mishandled.
Indicates a situation which might cause serious injury or death to
the user, if the product is mishandled.
Indicates a situation which might cause minor injury to the user or
the occurrence of physical damage only, if the product is
mishandled.
If any part used in the product fails, contact your dealer or MIURA sales office to replace it with its
genuine part. Using parts of different models might reduce safety.
It should be noted that unauthorized alteration of the MW model system integrated water softener or
repair procedures other than those described herein can pose a serious safety risk. Never make any
modifications or repairs without MIURA’s permission.
DANGER
WARNING
CAUTION

Introduction
ii
Introduction
This document describes the methods of handling the MW model system integrated water softener
(hereinafter, the “water softener”) to ensure its proper use.
Not only those who use the boiler for the first time but also those who know the handling methods
should read this document carefully and understand the proper handling methods before use of
the water softener.
Furthermore, we also recommend that this Operation Manual be stored in close proximity to the
water softener so that it can be referred to at any time to confirm the correct usage.
[Explanation of Notation]
The meanings of the symbols used in this manual are as shown below.
Indicates a prohibited action (what you must not do).
Indicates a possibility of injuries when the specified position is touched.
Indicates a possibility of electric shock when the product is handled with wet
hands.
Indicates an action to be taken according to an instruction (what to be
executed).
Indicates an action connecting a grounding wire.
Indicates a caution.
Indicates a possibility of injury due to high temperatures under specific
conditions.
NOTE Describes the precautions to prevent failures of the water softener, points to
perform effective operation, and useful information to know.
Indicates the page of related information.

Definition of Terms
iii
Definition of Terms
Special terms used in this document are summarized below. Learn the terms and their meanings.
Terms are indicated with an asterisk (*) in the text.
Term
Explanation
Hardness
The amount of calcium and magnesium dissolved in water.
These substances are the main cause of scale buildup after they
enter the boiler.
Raw water
Water supplied to the water softener.
Soft water
Water from which the hardness components are removed.
Ion exchange resin
Resin particles which can chemically absorb and remove the
hardness components in the raw water. Brine is used periodically to
regenerate the resin during operation.
Service (Water flow)
Normal state in which the water softener is operating to obtain
softened water or a state in which water is passed through the water
softener and either soft water or raw water is supplied to the
secondary side.
Regeneration
Processes to recover the ion exchange resin saturated with hardness
components to reuse it.
(MW-35U to 400U include the five processes of Backwash, Brine,
Slow Rinse, Fast Rinse, and Refill. MW-600U and MW-1000U include
the seven processes of Backwash, Brine, Slow Rinse, Brine 2, Slow
Rinse 2, Fast Rinse, and Refill.)
Regenerating salt
Salt used for regeneration. If you use rock salt, it may result in failures
like clogging of the brine line. We recommend that you use pure
regenerating salt for water softeners.
Scale
Substance formed by impurities contained in the water, such as
calcium and magnesium, which adhere to the water tube of the boiler.
No. 1 unit
The primary unit for MW-35U to 400U, and the unit with a pressure
gauge for MW-600U and MW-1000U of two units constituting the
water softener.
No. 2 unit
The secondary unit for MW-35U to 400U, and the unit without a
pressure gauge for MW-600U and MW-1000U of two units
constituting the water softener.
Hardness removal
capacity
A number to indicate the performance of the water softener, referring
to how many hardness components can be removed in a regeneration
cycle.
Softened water supply
capacity
A number to indicate the performance of the water softener, referring
to how much water can be treated in a regeneration cycle. The water
softening volume may vary depending on the hardness of the raw
water.
Soft water check
A method that uses a hardness indicator to check whether the water
is softened.

Table of Contents
iv
Table of Contents
Important Safety Information .................................................................... i
Introduction ............................................................................................. ii
Definition of Terms ..................................................................................iii
SECTION 1: SAFETY .......................................................................1
1. Safety Regulations............................................................................. 1
2. Safety-related Knowledge and Expertise ........................................... 2
3. Protective Equipment......................................................................... 2
4. Prohibition of Unapproved Modification ............................................. 2
5. Warning Labels on the Water Softener .............................................. 2
5.1 MW-35U,65U.................................................................................................. 3
5.2 MW-100U, 150U, 250U, 400U........................................................................ 3
5.3 MW-600U, 1000U........................................................................................... 4
6. Safety Precautions............................................................................. 5
6.1 Safety during Installation ................................................................................ 5
6.2 Safety during Inspection and Preparation (Excerpt from Page 27 Onward) ... 6
6.3 Safety during Operation (Excerpt from Page 28 Onward) .............................. 7
6.4 Safety during Inspection and Maintenance (Excerpt from Page 35 Onward) . 8
6.5 Safety during Troubleshooting (Excerpt from Page 41 Onward) .................... 9
6.6 Safety during Storage (Excerpt from Page 46 Onward) ............................... 10
SECTION 2: OVERVIEW................................................................ 11
1. Usage and Functions....................................................................... 11
1.1 Usage............................................................................................................11
1.2 Functions.......................................................................................................11
2. Work Mechanism ............................................................................. 12
2.1 Removal of Hardness(*) ................................................................................ 12
2.2 Regeneration(*) of Ion Exchange Resin(*)...................................................... 13
2.3 Water Softener Processes............................................................................ 14
3. Features .......................................................................................... 15
4. Specifications .................................................................................. 16
Note 5................................................................................................................. 17
5. Component Names.......................................................................... 20
5.1 Component Names (MW-35U, 65U) ............................................................ 20
5.2 Component Names (MW-100U, 150U, MW-250U, and MW-400U).............. 21
5.3 Component Names (MW-600U and MW-1000U) ......................................... 22
5.4 Names and Functions for the Control Panel................................................. 23

Table of Contents
v
SECTION 3: OPERATION ..............................................................24
1. Working with the LCD Screen ..........................................................24
1.1 LCD Screen Display......................................................................................24
1.2 Details for Each Display Item .......................................................................25
2. Inspection and Preparation for Operation.........................................27
3. Preparation before Use ....................................................................28
3.1 Connecting the Water Softener to a Power Supply .......................................28
3.2 Replenishing Regenerating Salt(*) .................................................................28
3.3 Checking Raw Water(*) Pressure...................................................................29
4. Start and Stop ..................................................................................30
4.1 Start ..............................................................................................................30
4.2 Stop...............................................................................................................32
5. Manual Regeneration(*) ....................................................................33
SECTION 4: INSPECTION AND MAINTENANCE................................35
1. Inspection and Maintenance Checklist .............................................35
2. Daily Inspection and Maintenance....................................................35
2.1 Soft Water(*) Check........................................................................................35
2.2 Check for Regenerating Salt(*).......................................................................36
3. Inspection and Maintenance to be Performed Every Four Months ...37
3.1 Raw Water(*) Quality Check...........................................................................37
3.2 Strainer Cleaning ..........................................................................................38
4. Inspection and Maintenance to be Performed Every Five years.......40
SECTION 5: TROUBLESHOOTING...............................................41
1. Checks and Actions in Case of Failure .............................................41
1.1 Types of Notice .............................................................................................41
1.2 Error ..............................................................................................................41
1.3 Caution and Notice........................................................................................43
1.4 Actions to be Taken before Ordering Repairs................................................45
SECTION 6: STORAGE .................................................................46
1. Inactivity of the Water Softener ........................................................46
2. Transfer or Resale............................................................................46
3. Export ..............................................................................................46
SECTION 7: DISPOSAL .................................................................47
1. Disposal ...........................................................................................47

Table of Contents
vi
SECTION 8: WARRANTY...............................................................48
1. Questions regarding Warranty ......................................................... 48
2. Questions regarding the Product and Operation Manual ................. 48
3. If the Operation Manual is Lost ........................................................ 48

SECTION 1: SAFETY
1
SECTION 1: SAFETY
1. Safety Regulations
Handling of the water softener is comprised of operations associated with running of the equipment
and operations regarding maintenance.
Only those who have received a handling explanation with this document should operate the water softener.
Applicable to All Water Treatment Equipment (Related Laws and Regulations) Document No.: 98-002-05-01
<Precautions for equipment installation and use> — Related laws and regulations
1) The table below shows part of the laws and regulations on the installation and use of water treatment equipment. Refer to the separate document for
more information on other relevant laws and regulations.
(There are also prefectural and municipal ordinances; therefore, contact the supervisory authority or competent authority for more information.)
2) The information listed in the table was created based on the laws and regulations in effect when the information was published.
3) The documents to be submitted and their destination vary depending on your equipment and facilities.
If you have any questions, contact your nearest dealer, MIURA sales office, or the competent supervisory authority.
4) The laws and regulations listed below may not apply to all water treatment equipment. Refer only to those laws and regulations that apply to your
equipment and facilities.
Related laws and
regulations
Form(s) to be submitted Destination
Submission
timing
Remarks
Water Quality
Pollution Control Act,
River Act, Sewerage
Service Act, etc.
Verification required from local towns and cities in which the water
treatment equipment or other equipment is installed.
(The laws and regulations in some areas may be defined even
more specifically in accordance with regional regulations.)
Drain water may be produced depending on the type of
water treatment equipment and equipment operation. Drain
water must be treated in other ways to prevent it from
damaging waterways and the like.
In cases where the total amount of drain water exceeds the
legal amount on a per-plant basis or where the equipment is
used at specified facilities, an application is necessary.
However, the conditions may vary from region to region.
Accordingly, you should contact your local authorities for
more information.
Regional Pollution
Prevention
Ordinance
Notification as required
by the applicable
ordinance
As set forth by the
relevant regional
authorities
As set forth by
the relevant
regional
authorities
Applicability is defined independently by regional pollution
prevention ordinances based; accordingly, you should
contact your local authorities for more information. (Certain
regional ordinances concerning air pollution, noise, vibration,
drain water, and the like may supersede the corresponding
national regulations.)
Water Supply Act
———
(Prohibition of direct waterworks contact)
Water treatment equipment (excluding certified equipment)
cannot be connected directly to waterworks. Instead, it is
necessary to either set up a feed water tank or to isolate the
systems using, for example, a float valve.
Details may vary from region to region; accordingly, you
should contact your local authorities for more information.
Design specifications for
dedicated waterworks,
Notification of the start of
feeding water
As set forth by the
relevant regional
authorities
—
Business operators are to submit notification to local
governments for drinking water wells for industrial use in
facilities where the volume of water intake exceeds the
allowed quantity as prescribed by law which require the use
of dedicated waterworks systems regardless of the form of
usage. Contact your local authorities for details.
Act on Maintenance
of Sanitation in
Buildings
———
Buildings are to be preserved and maintained (through
cleaning, water quality analysis, and other activities) in
accordance with Hygiene Control Standards.
Food Sanitation Act
No notification made for
equipment and related
matters
——
Measures are to be implemented to maintain hygiene and
safety and prevent sanitation hazards in accordance with
applicable laws.
Industrial Safety and
Health Act
Notification of plans
Chief of the Labor
Standards
Inspection Office
30 days before
the start of
installation work
When installing a facility where substances specified in
applicable laws (such as specified chemical substances) are
handled, it is necessary to submit a notification of facility
planning. (Dilute sulfuric acid and hydrochloric acid are
specified chemical substances.)
———
When using substances specified in applicable laws (such
as specified chemical substances), a qualified operator must
be selected, all such substances are to be handled and
managed in accordance with applicable laws, and the
operator’s healthcare is necessary.
Poisonous and
Deleterious
Substances Control
Act
———
All such substances are to be stored and managed in
accordance with applicable laws. Chemical substances are
to be handled properly in accordance with the guidance and
information listed on the SDS for the relevant material.
Fire Service Act Notification as set forth
by local fire departments
The nearest fire
department
Prior to the start
of work
Local fire chiefs or fire department chiefs must be notified in
advance of any plans for any party to use or store certain
substances (chemical substances and other materials) of a
designated quantity as specified by applicable laws and
regulations.

SECTION 1: SAFETY
2
2. Safety-related Knowledge and Expertise
Usage of the water softener requires knowledge and experience of the operation and
maintenance of mechanical equipment.
In addition, only the following persons should be permitted to perform work on the water
softener.
•Operators who have read and fully understood this Operation Manual.
3. Protective Equipment
Remember to wear a helmet, protective glasses, protective mask, safety shoes, safety gloves,
and other protective equipment depending on the work.
4. Prohibition of Unapproved Modification
It should be noted that unauthorized alteration of the water softener or repair procedures other
than those described herein can pose a serious safety risk. Never make any modifications or
repairs without MIURA’s permission.
5. Warning Labels on the Water Softener
Warning labels are pasted at all locations that require attention to be paid during operation.
If any warning label is peeled off or torn, replace it with a new one.
For further details on warning labels contact your dealer or MIURA sales office
Applicable to All Water Treatment Equipment (Related Laws and Regulations) Document No.: 98-002-05-02
<Precautions for chemical management and handling> — Related laws and regulations
1) The table below shows part of the laws and regulations on chemical management and handling. There are also prefectural and municipal
ordinances; therefore, contact the competent administrative authority for more information.
2) This table shows the laws and regulations as of the end of September 2017. For the most up-to-date information, contact the competent
administrative authority.
3) The management and handling differ depending on the chemicals you handle. If you have any questions, contact your nearest dealer, MIURA sales
office, or the competent administrative authority.
Related laws and regulations Destination Submission
timing Remarks
Common
precautions for
management and
handling
Poisonous and Deleterious
Substances Control Act ——
If the chemical product is a deleterious
substance, it is necessary to perform
appropriate storage management, etc. as a
person handling it in businesses.
The laws and
regulations
applicable to each
chemical product
are described in
the SDS (Safety
Data Sheet).
Manage the
chemical products
in accordance with
the laws and
regulations. Refer
to the SDS for
details about
proper handling of
each chemical
product.
Act on Confirmation, etc. of
Release Amounts of Specific
Chemical Substances in the
Environment and Promotion of
Improvements to the
Management Thereof (Law
concerning Pollutant Release
and Transfer Register (PRTR))
Authority in the
prefecture to which
the location of each
office belongs
Year ly
(April to June)
When handling one ton or more of a Class I
designated chemical substance (0.5 ton or
more of a specific Class I designated
substance), as mentioned in the act, it is
necessary to submit a notification depending
on the target industry type and the number of
permanent employees.
Industrial Safety and Health Act ——
According to the act, if a chemical product
containing chemical substances that require
risk assessment in an amount equal to or more
than the cut-off value is newly adopted, or the
work procedures to handle it are changed, the
business operator is required to perform risk
assessment.
*The risk assessment refers to the
identification of the dangers and hazards of a
chemical substance or its manufacture,
estimation of the extent of possible harm or
health hazard to the worker, and examination
of the risk reduction measures.

SECTION 1: SAFETY
3
5.1 MW-35U,65U
5.2 MW-100U, 150U, 250U, 400U
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SECTION 1: SAFETY
4
5.3 MW-600U, 1000U

SECTION 1: SAFETY
5
6. Safety Precautions
6.1 Safety during Installation
During installation, observe the following safety information.
The AC/DC adaptor and surge protector are not waterproof.
Do not place them on the floor but install them in a position not subject to water.
If this precaution is not observed, serious accidents such as electric shock and
outbreak of fire may result.
During power source installation work, use a specified wire diameter for
connection and ensure that a ground is established.
(Japanese D-type grounding or better)
Furthermore, a dedicated power supply should be used and an earth leakage
circuit breaker (with overcurrent protection) should be set up. If this precaution is
not observed, serious accidents such as electric shock and outbreak of fire may
result.
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Ensure that drain piping is fixed securely in place to prevent it moving in reaction
to water discharge and that the end of the piping opens in a safe location such as
a pit. Splashed water can cause electric shocks, burns, or other injuries.
Drain piping
Drain piping
Pit
Ground
terminal
Ground
Earth leakage circuit breaker
(with overcurrent protection)
Earth leakage circuit breaker
(with overcurrent protection)
Wiring
Breaker
capacity
WARNING
WARNING
WARNING

SECTION 1: SAFETY
6
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6.2 Safety during Inspection and Preparation (Excerpt from Page 27 Onward)
During Inspection and Preparation, observe the following safety information.
Dew drops may occur depending on environment conditions including the raw
water temperature and the atmosphere in the installation location. If necessary,
take measures to prevent dew condensation on this device and external piping,
such as installing heat insulation.
Also, factors such as loose connectors and aging of pipe materials can lead to
water leakage. In order to prevent water from leaking outside the room or
downstairs, take appropriate measures against drain water on the installation
surface of water treatment equipment and peripheral equipment.
• Setting up a drain ditch that completely
encloses the whole equipment
• Applying a waterproof treatment to the floor,
and making the floor slope downward to the
drain ditch
CAUTION
Drain ditch
Do not place combustible materials inside the control box.
Failure to observe this precaution can lead to the outbreak of fire, which can
result in injury or even death.
Make sure no water is leaking from the water softener or from around the piping.
Turning the switches ON or OFF during a water leak may result in electric shock
or fire from a short circuit.
WARNING
WARNING

SECTION 1: SAFETY
7
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6.3 Safety during Operation (Excerpt from Page 28 Onward)
During operation, observe the following safety precautions.
Do not operate the main power supply breaker with wet hands. Failure to
observe this precaution may result in electric shock, injury, or death due to
contact with high voltage.
WARNING
Dew drops may occur depending on environment conditions including the raw
water temperature and the atmosphere in the installation location. If necessary,
take measures to prevent dew condensation on this device and external piping,
such as installing heat insulation.
Also, factors such as loose connectors and aging of pipe materials can lead to
water leakage. In order to prevent water from leaking outside the room or
downstairs, take appropriate measures against drain water on the installation
surface of water treatment equipment and peripheral equipment.
• Setting up a drain ditch that completely
encloses the whole equipment
• Applying a waterproof treatment to the floor, and
making the floor slope downward to the drain
ditch
CAUTION
Drain ditch
When cutting off water flow(*), make sure the “OPERATION” switch of the boiler
is OFF. If the water flow(*) stops during operation of the boiler, it may result in
abnormal stop and boil-dry due to low water level.
CAUTION

SECTION 1: SAFETY
8
6.4 Safety during Inspection and Maintenance (Excerpt from Page 35 Onward)
During inspection and maintenance, observe the following safety precaution.
Make sure that the power plug is not dusty or the plug is not loose.
There is a risk of serious accident such as fire.
WARNING
If the Caution [C210-01]/[C210-02] (Control valve defect) or [C210-03]/[C210-04]
(Controller defect) occurs in the water softener, do not perform manual
regeneration(*) during boiler operation. If manual regeneration(*) is performed, the
normal unit enters the regeneration(*) process, and the following situations occur.
In the case of the MW-35U to 400U
Water bypass occurs in the control valve during regeneration(*). Hard water is
supplied and scale(*) buildup may occur in the boiler during regeneration(*).
In the case of the MW-600U and MW-1000U
Water bypass does not occur in the control valve during regeneration(*). Water
flow(*) may stop completely during regeneration(*).
If manual regeneration(*) is performed by mistake and the water flow(*) stops,
confirm that the unit in which the Caution has occurred can be bypassed, and
then bypass the unit to avoid stopping of water flow(*).
Refer to the following section for details on the bypass method.
“4.2 Stop” in SECTION 3 on page 32
CAUTION
The AC/DC adaptor and surge protector are not waterproof.
Do not place them on the floor but install them in a position not subject to water.
If this precaution is not observed, serious accidents such as electric shock and
outbreak of fire may result.
WARNING

SECTION 1: SAFETY
9
6.5 Safety during Troubleshooting (Excerpt from Page 41 Onward)
During the troubleshooting, observe the following safety precaution.
When the Alarm [A210-01] (Both units failure at same time) occurs, in the case
of the MW-35U to 400U, hard water is supplied and scale(*) buildup may occur in
the boiler. In the case of the MW-600U and MW-1000U, water flow(*) may stop
completely. (The water flow(*) stops when both units fail during regeneration(*).)
If the Alarm occurs, immediately check the water flow(*). If the water flow(*) has
stopped, bypass the both units.
Refer to the following section for details on the bypass method.
“4.2 Stop” in SECTION 3 on page 32
CAUTION
Check the water quality once every four months.
Failure to complete the check of water quality may result in decreased boiler
efficiency and water tube damage due to hardness(㸨) leakage.
Since the AC/DC adaptor is a consumable part, replace it every five years.
If the AC/DC adaptor has not been replaced, scale(*) may buildup in the boiler
because power supply to the water softener stops and raw water(*) is supplied
due to the AC/DC adaptor malfunction.
CAUTION
CAUTION

SECTION 1: SAFETY
10
6.6 Safety during Storage (Excerpt from Page 46 Onward)
During transfer or resale, observe the following safety precaution.
Ensure that the water softener is installed only in the specified condition and
connected to the specified peripheral equipment.
Failure to observe this precaution may result in injury.
WARNING
If the Caution [C210-01]/[C210-02] (Control valve defect) or [C210-03]/[C210-
04] (Controller defect) occurs and the normal unit enters the regeneration(*)
process, the following situations occur.
In the case of the MW-35U to 400U
Water bypass occurs in the control valve during regeneration(*). Hard water
is supplied and scale(*) buildup may occur in the boiler during regeneration(*).
In the case of the MW-600U and MW-1000U
Water bypass does not occur in the control valve during regeneration(*), and
the water flow(*) may be stopped in the unit in which an error has occurred. If
the normal unit enters the regeneration(*) process in such a state, the water
flow(*) may stop completely.
If the normal unit enters the regeneration(*) process and water flow(*) stops
when the Caution above occurs, confirm that the unit in which the Caution
has occurred can be bypassed, and then bypass the unit to avoid stopping
of water flow(*).
Refer to the following section for details on the bypass method.
“4.2 Stop” in SECTION 3 on page 32
CAUTION

SECTION 2: OVERVIEW
11
SECTION 2: OVERVIEW
1. Usage and Functions
1.1 Usage
This product is a device that supplies soft water(*) by using ion exchange resin(*) to remove
hardness(*) (calcium and magnesium ions) from water.
NOTE
This product is not suitable for beverage and food processing, so make sure the treated
water is not to be directly used for human consumption.
1.2 Functions
Various kinds of impurities are dissolved in the mains water and well water widely used for
boilers. In particular, the hardness(*) in water are the main cause of the scale(*) buildup in
the boiler pressure vessels that results in a considerable decrease in the operating
efficiency and service life of the boiler. In order to maintain boiler operating efficiency for
long-term operation, it is necessary to prevent scale(*) buildup.
The water softener utilizes ion exchange resin(*) to remove the hardness(*) from the raw
water(*) that are the main contributors of scale(*) buildup in the boiler.
This product is also a water softener with efficient regeneration(*), a high level of reliability
with regard to hardness(*) leakage, and labor saving in regenerating salt(*) management.

SECTION 2: OVERVIEW
12
2. Work Mechanism
2.1 Removal of Hardness(*)
As shown in Figure 2-1, raw water(*) (hard water) is introduced from the raw water(*) inlet at
the top. When the raw water(*) flows through the ion exchange resin(*) layer, the resin
absorbs hardness(*) in the raw water(*), such as calcium and magnesium ions.
In this way, the hardness(*) is removed from the raw water(*), and the soft water(*) is
collected from the treated water outlet.
Moreover, there is a limit on the amount of hardness(*) that can be absorbed by the ion
exchange resin(*), so the amount of hardness(*) that can be removed depends on the
volume of resin.
Figure 2-1: Mechanism of hardness(*)-components removal
Raw water(*) (Hard water)
Treated water(*) (Soft water(*))
Ion exchange resin(*)
Calcium ion
Magnesium ion
MW-35U to 400U
MW-600U and MW-1000U
Raw water(*) inlet
Treated water outlet
Raw water(*) inlet
Treated water outlet