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Individual foil packets that contain powder. A Formaldehyde and Bronopal Free formula. Campground friendly and complies with California regulations. The quick-acting holding tank treatment eliminates odors while digesting waste and toilet paper to prevent clogging, all without any harsh chemicals. Proudly made in the USA, Thetford's AquaBio™ is formulated and tested safe for all RV toilets, holding tanks and septic systems. No FormaldehydeNo BronopalOdor Eliminator and Waste DigestorCalifornia CompliantFresh citrus scent