Foam -Water Systems are divided into two main categories; Foam -Water Sprinkler Systems and Foam-Water Spray Systems. A Foam -Water Sprinkler System is a special system pipe-connected to a source of foam concentrate and to a water supply and equipped with appropriate discharge devices for extinguishing agent discharge and for distribution over the area to be protected. A Foam-Water Spray System is a special system pipe-connected to a source of foam concentrate and to a water supply and equipped with foam water spray nozzles or foam monitors for extinguishing agent discharge (foam or water sequentially in that order or in reverse order) and distribution over the area to be protected. In both systems, the piping system is connected to the water supply through a control valve that is usually actuated by operation of automatic detection equipment installed in the same areas as the sprinklers. When this valve opens, water flows into the piping system,foam concentrate is injected into the water with the use of the suitable mixing method (foam proportioners with foam pumps,bladder tanks or inline) and the resulting foam solution discharging through the discharge devices (or nozzles) generates and distributes foam. Upon exhaustion of the foam concentrate supply,water discharge will follow the foam and continue until shut off manually.