We never have any problems with waste smell for our cat. Dr. Elsey's litter and a scooping out each morning is all it takes for us. We use a litter genie, this is key because it air-tightly stores the nuggets, which a regular garbage bin won't do. There's really no smell unless the little bugger leaves his nuggets without ANY sort of burial. Even then, it's a mild smell, I mask up, no problemo.