Kenmore 625.385720, 625.385700 owner manual Care Of Your Reverse Osmosis System

- 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 flom 6.8 to 7.7, the cartridge may last for well over one yea1: How- eve_, 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.Pu_ige the RO membrane cartridge following 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.

o-ring sen

let

col-

/

drain port

flow (control) insert

1/4" tubing

TO

DRAIN

Figure 13

15

Problems, Questions? Call 1-800-426-9345 Kenmore Water Line