Porta-Pak, 10/bag RV holding tank deodorizer is powerful and easy to use. Just drop a single Porta-Pak into the camper holding
tank and add water. The RV industry's most powerful portion control
in one convenient package. 1 pack controls odor and treats waste in
camper holding tank up to 40 gallon capacity. Continued use will keep
your RV holding tank odor-free and your sensors clean and operational.