Aqua MaxA(R) holding tank treatment&';s advanced enzyme powered formulas, all at the same time. Thetford&';s beneficial probiotic treatments are Bronopol Free and Formaldehyde Free to provide campground friendly and California compliant solutions. Thetford&';s new family of Aqua MaxA(R) holding tank treatments have been extensively researched and tested safe for all RV and marine toilets, holding tanks and septic systems.