[Carl n Susan]

The washer drain will go to several different places depending on your model and the what the Old Worlds Craftsman felt like doing that day. I have seen it go to the grey tank (most common), straight to the outlet, or to the black tank (rare and the worst).

There will be a sticker on the wall where the washing machine goes. DO NOT believe it. Pour water down the drain and determine for your self the destination.

This no flush system for the grey tanks. There is, of course, one for the black tank(s).

Rinsed cat poop isn't my favorite thing to run to a grey tank, but it probably isn't too big a deal if you fill and dump it frequently