The 20 GPM High Flow Level Master™ is a water driven chemical proportioner that will automatically refill a customer-supplied tank with ready-to-use chemical solution. When the solution in the tank drops below a pre-set level, the float valve triggers air-activated solenoids to start the flow of water. Using city water pressure (35 - 125 PSI), this venturi system draws and blends chemical concentrate into the 21.2 GPM @ 40 PSI water stream to create an accurately diluted solution. The system cycles continuously and a secondary fail-safe float prevents overfilling.