Hozon Injector Brass Siphon Mixer Brass Siphon Mixer with Backflow Preventer. A time-tested, accurate proportioning device designed for small scale growers for the dispensing of fertilizers, insecticides, fungicides and other water soluble chemicals through a hose. The Hozon Siphon Mixer proportions at the rate of 1 gallon of concentrate to 16 gallons of water, 8 ounces of concentrate per gallon of water. One gallon of concentrate is dispensed in 3 to 5 minutes. Hozon needs 35 p.s.i. minimum in order to operate!