Rather than buy nasty and expensive chemicals for the waste tanks try using a 1/2 cup of good old Borax laundry detergent and 1/4 cup of Calgon Water Softener. The Borax helps control odor, cleans and the water softener prevents waste from sticking to the walls of the waste tank. Camper, Rv, Vw Camper, Glamping, Camping, Caravan, Motor Home Camping, Camping Hacks, Rv Campers