Whirlpool WHER18 Troubleshooting Guide download pdf (Page 5)

Reverse Osmosis Information

The Reverse Osmosis (RO) Drinking Water System is a water treatme nt unit. It uses household water

pressure to reverse a natural physical process called osmosis. Water, under pressure , is forced through

a semi-permeable membrane where minerals and impurities are filtered out. Clean drinking water goes

to the faucet or storage tank, while minerals and impurities are sent to the drain with RO waste water.

The minerals and impurities are measured in water as total dissolved solids (TDS).

The reverse osmosis system includes replaceable pre and postfilter sediment-carbon cartridges. The

prefilter removes sand, silt, dirt, rust particles, other sediments, and chlorine from the water supply be-

fore it can enter the RO membrane. The postfilter removes any tastes and/or odors that may remain

in the water, after passing through the RO membrane, before going to the RO faucet. To prevent water

waste, an automatic shutoff valve closes when the RO faucet is closed and the storage tank is full.

The reverse osmosis system gives a continuous supply of sparkling clear, delicious water for drinking,

cooking and other uses. The reverse osmosis process makes water very slowly, that is why there is a

2.3 gallon* storage tank. This will enable you to have high quality R.O. product water for your cooking

and drinking water needs.

* Exact storage capacity depends on water pressure.

How a Reverse Osmosis System Works

Prefilter

Water from the cold water supply pipe enters the RO assembly prefilter first. The prefilter has a re-

placeablesedimentcartridge withactivated carbon inits composition. The cartridge removes sand, silt,

dirt, other sediments, and up to the ppm of chlor ine shown in the specifications from the feed water.

See “Product Specifications” section. Chlorine can adversely effect the RO membrane life. Filtered,

clean, chlorine--free water flows from the prefilter, to the RO membrane cartridge.

Reverse Osmosis (RO) Cartridge

The RO cartridge is a tightly wound specia l membrane. The membrane removes the dissolved solids

and organic matter when water is forced through the cartridge. High quality product water exits the

RO cartridge and goes to the storage tank, or to the postfilter and RO faucet. Reject water, with the

dissolved solids and organic matter, is routed through the flow control and to the drain.

Storage Tank

The storage tank holds up to 2.3 gallons of product water. The higher the incoming water pressur e, the

more water will be stored in the tank, up to 2.3 gallons. A diaphragm inside the tank keeps water pres-

surized to about 30 psi, when the tank is full, to provide fast flow to the RO f aucet. The dry side of the

diaphram that divides the tank is pressurized with air to 5 -- 7 psi.

Post Filter

After leaving the storage tank, but before going to the RO faucet, product water goes through the post

filter. The post filter is an activated carbon type filter. Any remaining tastes and odors are removed

from the product water. Taste--free, odor--free, clean, high quality drinking water is available for use.

Faucet

The sink or countertop fauc et has a hand operated lever or knob to access drinking water. To comply

with plumbing codes, an air--gap is built into the faucet drain water connection.

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Whirlpool WHER18 Troubleshooting Guide Page 5