The Scotty 4010-3 is the most simple and effective method of deploying a foam surfactant/wetting agent onto a fire scene from a 3/4" garden hose. Professional firefighters use foam surfactants in their water to lower the water's surface tension, allowing it to spread and penetrate much more easily. To operate, simply open the inlet side of the mixing chamber, insert a foam cartridge, reseal the inlet end cap, attach to a 3/4" garden hose and spray foam. The 4010-3 will flow water at a rate of 3 gpm (12 Lt./m) when attached to a standard 3/4" garden hose line. The Scotty 4010 Foam Cartridges are biodegradable and are available separately. The 4010-3 is recommended for use with water pressures between 35 psi and 85 psi (the higher the pressure, the greater the reach of stream). Each 4010-3 Fast Foam unit comes with a 3 gpm Nozzle, the Mixing Chamber, a 3/4" Garden Hose Quick Connect with Shut-Off and 6 foam cartridges.