Sealand Max Control Granulated Tank Treatment - 12 pk 12 pack, 1.5 oz drop-ins Now, the most powerful odor control without formaldehyde for waste holding tanks is available in ultra-convenient drop-ins. Fast-dissolving packets provide quick odor control, and are compatible with MasterFlush electric macerator toilets and SeaLand gravity-discharge toilets. Rapid-dissolving packet Powerful odor control - even in hot weather Keeps tank interior clean Fresh, clean scent One packet treats up to a 40-g