Using gray water is not legal here so not even going to attempt to figure that out.
Letting it go through a filter and down the drain is much simpler.
@apg It’s one of those “if the health department finds out, you’re in trouble” things. Wouldn’t need a plumber to do it but also it’d be a bit complicated with a tank and pumps. Probably not worth it with my current urban house setup.
@mathiasx it’s not legal? Is the water company operated by the mob?