Reverse osmosis filters consist of a sediment prefilter used to remove physical sediment such as dirt and sand from water. A carbon prefilter is also used to remove chlorine from the tap water. The final stage in a reverse osmosis filter is the membrane itself. The membrane uses rejection to allow only pure water to pass through, while non pure water is rejected out the drain (or brine) line. Reverse osmosis filters operate best with at least 55 psi of water pressure and the input water temperature of at least 60 degrees. Without these parameters met, the amount of product water produced each day is greatly reduced.

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