Quick view Thetford AquaMax® Holding Tank Treatment - 1 Gallon - Spring Shower Scent - P/N 96637 Thetford Marine $44.99 AquaMax® Holding Tank Treatment - 1 Gallon - Spring Shower Scent 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... Compare Add to Cart Wish list