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Dunedin in Florida filters 13,250,000 litres per day using reverse osmosis and claims 100% of water is recycled for drinking.

http://www.switchurbanwater.eu/outputs/pdfs/W1-1_1-2_GEN_PAP...

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For comparison, a big-box purchased reverse osmosis home setup could have up to a 4:1 waste water ratio.

Yeah, I was amazed both when I saw how much water got wasted in home RO and how much wasn't wasted in industrial RO!

There are a few more parts you can buy for the home install to make it more efficient. I can see the manufacturers leaving it out due to install space and cost.

My system is relatively new, but this thread has my thinking of ways I can better use that 4 gallons of waste.

That's handy to know. I was investigating whether I could make my hydroponics system recycle the water but the waste ratio made it unattractive - it was only for science.

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