Reliant Water 10274 Septic Tank and RV/Boat Holding Tank Odor Eliminator and Cleaner, 1lb Plastic Container Sewper Rx does not have to be added daily or weekly - but only once every 30 days The product is granular, and is simple to apply with the supplied scoop The use of Sewper Rx will eliminate odors from septic tanks, and holding tanks in boats and RV camper trailers Consumes most organic wastes within 24 hours, including fiber and cellulose Increases septic and holding tank capacity