WIRELESS FLOW SWITCHING – WIRELESS CONTROLS – WIRELESS LEVEL CONTROL. Harwil’s wireless switch controls can be used with any type or brand of switch. Any time you need to control something way over there from somewhere else you can do it with Harwil’s Wireless Switch system. Harwil Flow Switches are used to detect or monitor water flow in both residential and commercial applications. Our Flow Switches can detect flow to turn on a water treatment device such as a chemical feed pump, UV or ozone. We even have systems that can detect flow to a single faucet in an apartment building. We also manufacture pump protection systems that shut down a pump if there is a flow problem to prevent it from running dry. We can also detect unusually high flow that indicates a broken pipe. We offer a wide range of flow switches from Heavy Duty Stainless steel that are used by the US Navy, to medium duty that are water proof and can be direct buried to low cost light duty for use by Original Equipment Manufacturers in their systems. Our level switches are used to control and maintain liquid levels in all kinds in tanks. We also manufacturer Pump-Up and Pump-Down Controllers both wired and wireless.