Float Switches for Water & Wastewater Treatment

A septic float switch is a buoyant device mounted inside a tank that rises and falls with the liquid level. When the liquid reaches a set height, the float triggers an electrical switch — activating or deactivating a pump or alarm. Stainless steel float balls with magnet integration provide precise, corrosion-resistant switching in septic environments.

The lifespan of a septic float switch depends heavily on the material and environment. Stainless steel float balls (304ss or 316ss) significantly outlast plastic alternatives due to their resistance to corrosion, chemical exposure, and mechanical stress. Properly pressure-tested stainless steel floats can reliably perform for many years in continuous wastewater service.

To check a sewage pump float switch, manually lift the float to simulate a rising liquid level and verify the pump activates. Inspect the float for damage, corrosion, or waterlogging that could affect buoyancy. Check the tether length and mounting position. Stainless steel floats are easier to inspect and clean than plastic alternatives due to their robust, non-porous construction.

304 stainless steel is the most common choice for wastewater float switches due to its corrosion resistance and durability. For harsher chemical or saline environments, 316 stainless steel is recommended. Both grades outperform plastic floats in longevity and resistance to the aggressive media found in wastewater treatment tanks and sump systems.

Yes. Float balls can be manufactured with custom thread sizes (including NPT, UNC, and metric options), through-tube fittings for rod-mounted systems, and internal magnet assemblies for reed switch activation. Custom sizes in both round and oblong shapes are available to match exact tank dimensions and system mounting requirements.

Round float balls are available from 1-1/2" up to 14" in diameter. Oblong floats range from 2x6" to 9x14" with various NPT and thread configurations. Custom sizes beyond standard inventory can also be manufactured. Multiple finishes — matte, brushed, and polished — are available to suit sanitary or industrial application requirements.

Beyond wastewater management, stainless steel float switches are used across multiple industries. In food and beverage processing, corrosion-resistant float balls monitor liquid levels in food-grade tanks containing oils, syrups, and process fluids. In chemical manufacturing, 316ss float balls safely monitor corrosive liquid levels in processing vessels. They are also used in industrial process control to activate sump pumps, control vacuum tanks, and regulate steam traps across heavy industrial systems.