AquaMax holding tank treatment's advanced enzyme powered formulas neutralize odors and accelerate waste digestion to prevent clumping, clogging and tank residue, all at the same time. Thetford's beneficial probiotic treatments are Bronopol Free and Formaldehyde Free to provide camground friendly and California Compliant solutions. Tested safe for all RV and marine toilets, holding tanks and septic systems. Made in USA.