Walchem’s polypropylene tank level switches work well in chemicals that are clean and non-coating or scaling. Polypropylene should be compatible with nearly all water treatment chemicals. The reed switch output provides a reliable input to our WebMaster series controllers.","These level switches come complete with support pipe of various lengths, 2 NPT drum mounting fitting and height adjustment gland.","The level switch is placed in the tank, with the switch positioned near the bottom of the tank. The specific gravity of the chemical raises the float, activating the switch. When the tank is empty, the float drops and the switch is deactivated.