Most RO systems are compact units installed under your sink. (In some cases, they can also be installed on the countertop). A typical system is comprised of one or more pre-filters, a reverse osmosis module, a post-filter, and a pressurized holding tank (see diagram below). The pre-filters trap sediment, chlorine, and other contaminants before allowing water to pass into the reverse osmosis module. The RO module, containing the RO membrane, further isolates a range of contaminants before allowing treated water through the post-filter. The treated water received a final “polishing” as it flows through the post-filter and into a holding tank connected to a tap on the kitchen sink. The waste water rejected by the RO is sent down another line into the drain.
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