A system for treating edible fluids under high pressure to reduce microorganisms. The system comprises a high pressure housing having an interior chamber containing two parallel flexible bladders adapted to hold the fluid to be treated under high pressure within the confines of the chamber. A pressurizing fluid fills the interior chamber outside the bladders. When one bladder is filled the other bladder is collapsed. In operation pressure is exerted throughout the interior chamber by means of the pressurizing fluid for a period sufficient to reduce microorganisms in the fluid within the filled bladder. Pressure will be released and the collapsed bladder will then be filled with an edible fluid causing treated fluid to be removed from the first bladder due to expansion caused by the filling of the second bladder such that the first bladder is collapsed. The process can then be repeated.
