The Thetford Aquamax Waste Holding Tank Treatment Drop-ins come in a pack of 16 tablets, with 2 packs included. These treatment tablets are designed to effectively treat waste holding tanks in RVs, trailers, and campers. They feature a Showers scent for a pleasant aroma while controlling odors and breaking down waste. The product is manufactured by Thetford and may contain materials cautioned by California Proposition 65.