Thetford AquaMax Holding Tank Treatment features an advanced enzyme-powered formula that neutralizes odors and accelerates 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. Proudly made in the USA, Thetford's new family of AquaMax holding tank treatments has been extensively researched and tested safe for all RV and marine toilets, holding tanks, and septic systems. Compliant with the state of California regulations.• Advanced enzyme-powered formula neutralizes odors and accelerates digestion of organic waste• Formaldehyde-free• Bronopol-free• Neutralizes odor• Breaks down waste• Prevents clumping, clogging, and tank residue• Enzymes optimized for MAX performance• Beneficial probiotics â good bacteria• Septic system safe• Campground and marina friendly• Compliant with all current regulations• 8 oz. treats a 40-gallon holding tank• 6-pack of 8-oz. bottles Beneficial probiotic treatment is Bronopol-free & Formaldehyde-free Safe for all RV & marine toilets & compliant with current regulations Six 8-oz. bottles | Thetford AquaMax Holding Tank Treatment, Summer Cypress Scent, 6-Pack of 8- oz Bottles Made in USA