64oz Pure Power Blue Enzyme RV Waste Digester and Deodorizer RV holding tank treatment is a bacterial-enzyme concentrate that is formulated with BioBlastPlus odor control technology. This technology has been scientifically proven to instantly control odors, even in temperatures over 120 degree F. Pure Power Blue camper holding tank treatment will quickly and effectively break down waste, toilet paper, grease and soap scum in both gray and black tanks. Economical, 2oz treats a 40 Gallon black or grey water tank. 100% Non-Toxic and 100% Biodegradable. California Compliant, approved at all campgrounds. 64oz (1/2 gallon) bottle.