Aqua Max holding tank treatments advanced enzyme powered formulas neutralize odors and accelerate waste digestion to prevent clumping, clogging and tank residue, all at the same time. Thetfords beneficial probiotic treatments are bronopol free and formaldehyde free to provide campground friendly and California compliant solutions. Thetfords new family of Aqua Max holding tank treatments have been extensively researched and tested safe for all RV and marine toilets, holding tanks and septic systems.