Little Giant Pumps & Liberty Pumps under-the-counter wastewater removal pump and basin units are designed to pump gray wastewater from laundry trays , drinking fountains, washing machines, multi-compartment sinks, bar sinks, utility sinks, dishwashers or dehumidifiers for homes, farms, commercial & industrial use. They are not designed to pump raw sewage, fluids other than water, or fluids with solids. NOT INTENDED FOR USE WITH CHEMICALS. They allow the freedom to install fixtures where gravity drain lines are not available. The units are designed to fit under most sinks, so in many cases it is not necessary to recess the unit into the floor. Tanks and pumps are shipped in separate cartons to protect during shipment. Assembly is required. An open vent must be used. A Studor vent or equal device cannot be used.