Installation, Operation and Maintenance Manual
Installation, Operation and Maintenance Manual
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17. Maintenance
Reverse Osmosis drinking water filtration systems contain treatment components that are critical for effec-
tive reduction of Total Dissolved Solids as well as inorganic chemical contaminants. We strongly recom-
mend that the user test the water periodically (every six months minimum) to verify that the system is per-
forming satisfactorily. A Percent Rejection (PR) Water Quality Monitor is available to provide the user with
a means to test the water at any time. Routine maintenance is necessary in the form of prefilter, postfilter
and membrane replacement.
Replacing Filter Cartridges
The life of filter cartridges generally depends on local water conditions (i.e., dirt, rust and/or chlorine levels)
and by the length of service.
When to Replace Filters
A) Every six months, or at the specified service cycle.
B) A noticeable decrease in water production is an indication that the filters require changing.
C) A decrease in water quality would be an indication.
How to Replace Prefilter and Postfilter Cartridges
A) Shut off feedwater saddle valve and tank valve. Open faucet to relieve pressure then close. Wait approxi-
mately 10 seconds for the water pressure to depressurize.
B) Twist the filter cartridge 1/4 turn to the left (counterclockwise) so that the ears on the cartridge are
able to disengage from the head. Then pull cartridge from the head. (It may be necessary to twist the
cartridge slightly from side to side to help free it.)
C) Remove new filter cartridges and the sanitary sealed wrapper from the box. Double check to see that
it is the correct replacement filter cartridge by comparing the labels.
D) Using tap water (or food grade silicone lubricant or glycerin), wet the o-ring seals to make insertion
easier.
E) Line up the cartridge ears, insert cartridge and push into the head until fully seated. Twist the cartridge
1/4 turn to the right (clockwise) to lock in place.
F) Turn on the feedwater and allow storage tank to fill completely (approximately 6 - 8 hours). Carefully
check for leaks.
H) Open faucet and empty storage tank to drain.
Replacing RO Membrane Module
The life of the RO membrane depends on local water chemistry and proper maintenance, e.g., regular filter
changes. Under typical conditions, the RO membrane life ranges from eighteen (18) months to three (3)
years because of its self cleaning feature.
The RO membrane should be replaced as determined by an optional percent rejection (PR) monitor. The
monitor is factory preset so that a green light will be displayed when the water quality is good, and a red
or yellow light indicates that replacement may be necessary. If a red or yellow light is displayed, the faucet
should be opened and the storage tank drained. After it has refilled, check the system again. If a red or yel-
low light is still displayed, the membrane should be replaced.
Recommended service life of the RO membrane is 36 months, maximum.
To reduce the risk associated with property damage due to water leakage:
• The disposable filter cartridge
must be replaced every six months or at the specified service cycle.
CAUTION
How to Replace the Membrane Module
Replacement of the RO module generally requires:
New replacement membrane module of the same type and performance and supplies for sanitizing.
A) Open faucet, shut off tank and turn off feedwater. Wait five minutes for RO assembly to completely
depressurize.
B) Disconnect tubing from all three connections on membrane module (refer to Figure 6). Please note
the tube color and respective fitting for re-connection.
C) Remove RO membrane module from clips and discard.
D) Position replacement module above clips and push into place. If necessary, rotate module so fittings
are aligned with respective tubing.
E) Insert each tubing end into respective “Push In” connector as far as it will go. Refer to Figure 6. Please
note that the blue tubes attach to center fittings on module.
F) Follow the sanitizing and start up procedures for the storage tank and purification assembly outlined in
the next section.
Sanitizing The RO Filtration System
For the highest quality water from your Aqua-Pure
®
RO drinking water filtration system, it is important to
routinely sanitize both the storage tank and the RO assembly.
When to Sanitize the Storage Tank
A) Upon start-up as described in Section 5 of the Installation Manual. NOTE: Standard Aqua-Pure RO
storage tanks need a special sanitizing agent which is activated when the storage tank is initially filled.
(See Section 5 in the Installation Manual.)
B) After any servicing or routine maintenance which involves the prefilter(s) or membrane.
C) After any extended period of non-use (over 30 days) unless cartridges are stored in a sealed plastic
bag in a refrigerator.
Refer to Section 5 Steps D through K to Sanitize Storage Tank.
How to Sanitize the RO Assembly
Sanitizing the RO Assembly generally requires:
• New pre and post cartridge
• Common household bleach (5.25% NON-scented)
• Standard eyedropper or equivalent
A) Shut off feedwater valve and tank ball valve.
B) Follow instruction of changing prefilter.
C) Before attaching new cartridge(s), use eye dropper to inject one teaspoonful (approximately 5 ml) of
household bleach into the center of each filter cartridge.
D) Turn on feedwater valve and tank ball valve.
E) Open faucet to allow tank to drain.
F) Close faucet valve and allow system to run for at least one hour.
G) Drain tank and discard water. NOTE: If any objectionable taste is noticed, drain tank again and allow
to refill.
H) Allow the system to run into the sink for the remainder of 24 hours to flush the membrane.
I) Close faucet. The filtration system should be ready to use as soon as the tank refills.
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• The sanitizing procedures are intended to be part of a routine maintenance program only and not designed to
sanitize systems that have become highly contaminated from misuse.
IMPORTANT NOTES
