The company HS Optimus Engineering have designed mixing device, respectively foam proportioning unit, for stable system installations with water flow 1000-4000 l/min and a pressure of 8-12 bar. This device is based on the proportional (volumetric) dosing of concentrate in a percentage of 3%. The system is independent of the power supply and uses the energy of water with a pressure drop of up to 2 bar. Can be used with AFFF foam concentrates, but also with others of similar characteristics. It is suitable for use in the system with sea water, because it is completely made of salt water resistant materials (bronze and stainless steel SS316). It can be made from duplex stainless steel also. If you are interested please contact us and will adapt to your requirements.