I've been doing gray water for a while. We've been in a drought for several years and this has helped my trees. I have a pier and beam house and installed a tee between the bath tub drain and sewer. From the tee it clears the foundation 3 feet and then goes into a french drain of 50' preforated black corrugated tubing. Between the 4 of us lots of water go down that drain. Using just the bath eliminates the floating macaroni. Washing machine has a 2nd drain which goes out the wall to another french drain taking care of fence line hedges. We have a front loader washer but still go through what seems to be a lot of laundry every week and its I'd hate to give this water back to the city after I've paid for it.
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