My washing machine at home uses 2 pass washing: 1. detergent and water for cleaning 2. water for rinsing

Centrifugal force is used to spin off the excess moisture in both pass.

Using the great water pressure created by the spinning, the waste water generated in the first pass may be forced through a membrane filtering system and reused for the rinsing pass.

I know that reverse osmosis is used to recycle waste water for drinking, but I don't know if some other cheaper filtering system exists.

Hope that'll help save some water bill and help a little in conserving our environment.
-- _dragonfly_, Mar 25 2003

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