the suspended solids or dissolved contaminants in a liquid matrix the compression of mechanically introduced or naturally entrained gases in water or other liquids produces a binding reaction between a chelating agent or coagulation chemicals to bind suspended solids or dissolved contaminants in the form of a precipitate as the fluid exits the throat of the venturi it expands under pressure producing and binding the entrained materials in the form of a precipitate a backpressure device or in line mixer reduces the turbulent flow from the venturi and stabilizes the composition of particles ranging in size from 10 to 200 microns the process of this invention does not require a pressurization cycle since the pressure is produced at the throat or entrance to the venturi this invention compresses or squeezes the injected chemicals whether using chelating or using coagulating chemicals to the reactive surface areas of the suspended or dissolved particles elements in solutions the precipitate is formed in the compression cycle and is stabilized under pressure as the chemically bound solution is released and expands from the venturi throat the resulting formed precipitates are relatively very large and therefore easy to filter through a standard filtration medium an important improvement in water treatment is creating large particle precipitates quickly efficiently and economically for filtering this invention solves the problems of lengthy reaction retention times uncontrolled particle sizes and the need for complex and expensive equipment to produce precipitates by using a venturi siphon and back pressure device to create precipitates of large relative size quickly efficiently and economically this present invention can be used in industrial commercial municipal governmental wastewater sewage treatment or drinking.