Unless your garage ceiling is unusually low, I would cut the washer stand-pipe as low as possible and install a temporary shower raised above the floor just enough to allow for a trap and let gravity take the water away. Or, talk with someone at an RV parts house or marine dealership about a flat-bottom gray-water tank and small discharge pump you can set next to a shower on a platform at least as high as the top of the tank or possibly even with the shower right on top of it.





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