Thetford 96527 Tank Blaster™ Holding Tank Cleaner, 4/pk

The first 2-in-1 tank cleaner specifically formulated for black & grey water & portable tanks. Cleans Overnight - then just dump and go Micro-Foam™ Action improves surface contact to vertical tank walls Super-concentrated enzymes actively attack and break down loosened deposits Special additives tackle hard water deposits on sensors Formulated safe for RV/Marine tanks, plumbing, seals and surfaces