Kenmore 625.347001 Care of Your Reverse Osmosis System, Prefilter and Postfilter Cartridges

-- CARE OF YOUR REVERSE OSMOSIS SYSTEM --

To keep your reverse osmosis system operating and making high quality water, you must make sure sup- ply 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 POSTFILTER

CARTRIDGES

You must replace the prefilter cartridge often to pro- tect the RO 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 postfilter 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	mounting
	washers (2)
	(RO cartridge
	o--ring seals on
	this end)
	RO Cartridge
prefilter
cartridge
(lt. gray)
	postfilter
	cartridge
	(blue)	o--ring
	o--ring seal	seal
		RO cap
	sump
Turn sumps in 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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