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What you'll find at the hardware store are drinking water reverse osmosis (RO) systems - not RODI systems.
Compared to good quality RODI systems, drinking water RO systems available at the hardware store typically have:
1. lower quality, and often higher priced prefilters
2. Very low capacity RO membranes (e.g., 12 gpd).
3. no pressure gauge
4. no tds meter
5. compression style fittings
6. no flush valve
7. opaque housings
Russ
The drin
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