I think many of us really waste a bunch of water with our RO/DI systems and everywhere else in our houses. A simple home grey water recycling system would cut our overall water bills 35 - 40%. You will just reuse all water except what is flushed down the toilet. The reused water will be used for the toilet flushing or watering the lawn. You would still send the RO/DI water down the drain, but it will just end up back in the grey water recycling system.