The water used to feed a RO filter system is taken from the cold water line under the kitchen sink. The cold water pressure should be at least 50psi. If the water pressure is lower than 50psi then a booster pump will be necessary.
The reverse osmosis system being installed will have either a CTA RO membrane or a thin film RO membrane. If a CTA RO membrane is being used then the tap water must be chlorinated. Some water supplies and especially private water wells may not be chlorinated. If the water supply is not chlorinated then a reverse osmosis system with a thin film RO membrane must be used.
If the reverse osmosis system is a 3-stage filter then it has a CTA RO membrane. If the reverse osmosis system is a 4 or 5-stage filter then it has a thin film RO membrane.
To install a Feed water supply valve:
- Disconnect the cold water supply flex line from the angle stop under the sink.
- Screw the feed water supply valve onto the angle stop.
- Connect the cold water supply flex line to the feed water supply valve.
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