The Thetford Aquamax Waste Holding Tank Treatment Drop-ins are designed to help break down waste and control odors in RV holding tanks. These drop-ins come in a Spring Showers scent and contain 16 tablets per pack. The product is manufactured by Thetford and its part number is 96639. Additionally, it is important to note that the product may contain materials cautioned by California Proposition 65, as indicated by the warning label.