Kenmore 625.3847 Care of Your Reverse Osmosis System, Prefilter and Post Filter Cartridges

- CARE OF YOUR REVERSE OSMOSIS SYSTEM -

To keep your reverse osmosis system operating and

producing high quality water, you must make sure supply water is always within the limits shown in the

specifications. Good supply water helps to assure

longer life from the RO membrane cartridge, prefilter

and postfilter cartridges. However, each of these will wear out in time and need replacement.

This reverse osmosis system contains a replaceable

treatment component critical for effective removal of

total dissolved solids. The water should be tested

periodically to verify the system is performing satis- factorily.

If the RO assembly is wall mounted, you may be able

to replace parts with the assembly left on the wall. If

not, simply lift the RO assembly from the mounting

washers and lay on the cabinet floor when replacing

the prefilter and post filter cartridges and RO mem- brane.

Note: To prevent spillage, place a container under

the RO assembly, or put the RO assembly in a con- tainer to catch the water.

CAUTION: Before disconnecting parts, be sure to close the water supply valve to the RO.

PREFILTER AND POST FILTER

CARTRIDGES

You must replace the pref!lter cartridge often to pro- tect the R O membrane from being destroyed by chlorine,

and/or from plugging with sediments in your water supply. If the water supply contains both chlorine

and sediments, replace the prefilter cartridge at least

every 6 months of product water use. Replace more

often than 6 months if it begins to plug with sedi- ments.

If the water has sediments only, with no chlorine, you

may notice a slower making of product water as the

prefilter collects the sediments. When this occurs, re-

place the prefilter cartridge. Also replace the post filter

cartridge.

To replace the filter cartridges (see FIG. 9):

1. Turn off the water supply and open the RO faucet to relieve pressure.

2.Remove (turn to the left) both sumps from the filter

heads. Be careful...the sumps are full of water.

3.Remove and discard the inner cartridges in a prop- er manner. Flush the insides of the sumps with fresh

water. Do not lose the large o-ring seals.

4.Insert new cartridges, and with lubricated* o- rings in place, turn on and tighten the sumps.

Note: The prefilter cartridge has light gray netting and end caps. The postfilter has blue. Do not inter- change,

*Note: Use a lubricant approved for use on a potable water supply.

FIG. 9 _ washersmounting(2)

(RO cartridge

o-ringseals on this end)

cartridgeo

posffUter

(blue)

o-ring l

o-ring seal seal

RO cap

sump

Turnsumpsin the

direction of the arrow

to remove. Turn

opposite way to install and tighten.

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 1 year. However, 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 FIG. 9):

1.Turn off the water supply and open the RO faucet to relieve pressure.

continued

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