What about using an irrigation valve on the RO input side? (I think they're about $20 at Home Depot). I think they use 24VDC so if you could find a power supply (Princess Auto would have them), all you'd need is the timer and you're set.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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