The heat exchangers are designed to fit the concentrated foam to the fixed and mobile hose line in an adjustable way. The Venturi system creates a vacuum inside the melanger and the concentrated foam is sucked through the vacuum hose. Melangers can be used horizontally and vertically. The body and the melanger are made of stainless steel (ASTM 304-316-316L) and the other parts are made of delrin. Melangers work with all types of water, including sea water, and is highly resistant to rust and corrosion.