Kenmore 625.385700 - Manual (Page 15)

- CARE OF YOUR REVERSE OSMOSIS SYSTEM
RO MEMBRANE CARTRIDGE
The life of the RO membrane cartridge depends
mostly on the pH of the supply water to the RO sys­
tem (see specifications). Cartridge life is shorter with
higher pH. For example, if supply water pH is from 6.8
to 7.7, the cartridge may last for well over one year: Hoio-
ever, cartridge life may be as short as 6 months if the pH
is as high as 8.5 to 10. Higher pH weakens the cartridge
membrane and causes pin-hole leaks.
It's time to replace the RO cartridge when the pro­
duction rate and/or quality of product water drops.
Product water may begin to taste different or bad, in­
dicating solids and organics are passing through the
RO membrane. To be sure it is the RO cartridge, re­
place the prefilter and postfilter cartridges first.
To replace the RO cartridge (see Figure 12):
1. Turn off the water supply and open the RO faucet
to relieve pressure.
2. Remove (turn to the left) the sump from the filter
head. Be careful. . .the sump is full of water.
3. Remove and discard the RO cartridge in a proper
manner. Flush the insides of the sump with fresh wa­
ter. Do not lose the large o-ring seals.
Note: Sanitizing is recommended after servicing in­
ner parts of the system (see page 11).
4. Insert new RO cartridges with o-ring seals to­
wards the top, and with lubricated o-ring in place,
turn to the right to reattach the sump.
5. Remove and replace batteries to reset counter and
timer, (monitor models).
6. Purge the RO membrane cartridge follaiuing instruc­
tions on page 11.
FLOW CONTROL
The flow control is vital for proper operation of the
RO membrane cartridge. The control keeps water
flow through the membrane at the needed rate to ob­
tain the best quality product water.
Periodically check the flow control to be sure the
small hole through it is clean and unrestricted.
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Problems, Questions? Call 1-800-426-9345 Kenmore Water Line