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Originally posted by ChicagoSigMan:
Question: My understanding is that RO filtration is very inefficient, yielding about 1 gallon of usable water for every 5 gallons put through this system. Is this what people are seeing and how does it affect your water bill?

It has no affect on my water bill. We capture the "waste" water from the RO system in buckets and use it for laundry, refilling the toilet tank upon flushing or in the garden.

Ours is more like 1:2. We use an APEC Water Systems countertop model (RO-CTOP – Portable 90 GPD Countertop Reverse Osmosis Drinking Water System).

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