Some I'm new to kegging and home draft beer. I just got my set up and need to get my co2 filled. I saw something the other day about food grade co2. Never heard of this before so I'm wondering if its a real thing or if all co2 is the same.
Garbage disposal isn't really ment for a lot of garbage like a ton of hops its fine without hops. As for the hops coming back up the tub you need to have a plumber snake your waste lines.