I just bottled my first partial mash. There was a thick layer of trub in the fermentor. Is it okay to throw the trub down the drain or did I just turn my septic tank into a 1500 gallon primary?
I'd toss the trub onto the compost pile. Now if there are dogs around, make sure they can't get into it; hops will kill them. You can also spread the trub in your yard, or mix into your garden soil.