The Stainless Steel Mercury-Free Float Switch is appropriate for a variety of applications; including sewage wet wells, storm water basins, water reservoirs, sludge tanks, irrigation canals and process sumps. The float operates reliably in even the most difficult environments. This float switch can be used singly to sense an alarm level, but typically two or more switches are used in conjunction with our controllers to provide a float-based control system. This float switch can be used as the redundant control sensor in larger automation installations. A 5.5″ float will displace one third more volume than a similar float with a diameter of 5″, and will provide almost twice the net buoyancy.