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Keeping a holding tank clean is mostly about giving waste and toilet paper somewhere to go besides sitting in the tank. Valterra's Pure Power Blue uses a bacteria-and-enzyme formula to liquefy solids for easier draining, while controlling odor at the same time.
It works in both gray and black water tanks, and the natural formulation is safe around kids and pets, plus accepted at campgrounds, RV parks, and dump stations that require septic-safe treatments.
Dose it after a dump to start the next trip with a cleaner, better-draining tank.