Jadnashua
Retired Defense Industry Engineer xxx
My father has a drywell that he pumps the washing machine into. This is separate from the septic system. Since it is the only thing on the drain line, other than a trap, does it need a vent line, too? Course, I'm not sure if this is quite legal, either, but has been in use for decades. I'm not sure how different it is from just dumping it into the septic system. Any enlightenment here?