Per mfg: The FloJet Portable RV Waste Macerator Pump Kit lets you empty holding tanks through a garden hose into a portable tank, toilet, sewer clean-out port, or septic tank, thereby avoiding the dump station. The macerator section grinds waste down to a particle size of 1/8" maximum so it can easily be pumped through a garden hose (5/8" minimum). The pump section is self-priming, permitting the unit to be mounted above the tank in a convenient location. Empties most recirculating toilets in less than 2 minutes; empties a typical 30-gallon holding tank in less than 3 minutes. Will not handle hard solid objects, sanitary napkins, or rags.