a housing having a cylindrical sidewall defining a cavity between an upper end and a lower end, the cavity including a mixture area proximate the lower end and an ozone area proximate the upper end, wherein the upper end of the housing comprises a cylindrical top cap;

an inlet configured to deliver a mixture of water and ozone gas to the mixture area through the lower end;

a cylindrical float positioned within the cavity and configured to move along a central axis of the cavity, wherein the cylindrical float is buoyant with respect to the mixture, the mixture forming a column around the cylindrical float and excess ozone gas from the mixture being directed past the cylindrical float to pool within the ozone area;

an ozone outlet configured to divert ozone gas from the ozone area out the upper end;

a piston connected to the cylindrical float to move simultaneously with the cylindrical float, wherein: when the column of the mixture rises above a threshold, the piston moves into a closed position in which the piston seals the ozone outlet; and when the column of the mixture is below the threshold, the piston moves into an open position in which the piston allows ozone gas from the ozone area to exit through the ozone outlet;

a piston housing surrounding the piston within the cavity and centrally attached to the cylindrical top cap around the ozone outlet, the piston housing including a plurality of side openings into the piston housing, the side openings providing a channel between the ozone area and the ozone outlet when the piston is in the open position, wherein the piston is configured to seal the side openings in the closed position; and

a mixture outlet configured to divert the mixture from the mixture area and out the lower end,

wherein the degassing chamber is configured such that an ozone gas pressure builds up in the ozone region over time such that the column of the mixture is eventually driven downward by the ozone gas pressure.