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Yeah, washing machines could work too.
I think some sort of basic filter would be needed no matter what (keep hairs and things out) as well as a holding tank, some sort of pump or pressure tank, and shut-offs/bypasses.
It would also need to be designed to still run water to the toilet even if the gray-water tank is empty, and divert water off to our black-water tank from the shower/washer/etc. if the gray-water tank is full.
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