Abstract: A liquid product is dispensed via a membrane contactor. The contactor employs a plurality of gas-permeable hollow fibers. The contactor has a gas port communicating with the interior of the fibers and input and output ports for liquid communicating with space within the contactor surrounding the fibers. A gas comprising carbon dioxide or nitrous oxide is dissolved in the liquid in the contactor. The gas at a controlled pressure is supplied to the gas port. The liquid is supplied at a higher pressure than the gas to the input port for liquid from a supply of such liquid via a first valve having a first valve inlet port communicating with the supply of liquid and a first valve outlet port communicating with the inlet port for liquid. Liquid with the gas dissolved therein is dispensed from the outlet port for liquid via a dispense tap to ambient. The dispensing liquid step includes a start dispense step in which dispensing commences and a stop dispense step in which dispensing is stopped.

Abstract: A liquid product is dispensed via a membrane contactor. The contactor employs a plurality of gas-permeable hollow fibres. The contactor has a gas port communicating with the interior of the fibres and input and output ports for liquid communicating with space within the contactor surrounding the fibres. A gas comprising carbon dioxide or nitrous oxide is dissolved in the liquid in the contactor. The gas at a controlled pressure is supplied to the gas port. The liquid is supplied at a higher pressure than the gas to the input port for liquid from a supply of such liquid via a first valve having a first valve inlet port communicating with the supply of liquid and a first valve outlet port communicating with the inlet port for liquid. Liquid with the gas dissolved therein is dispensed from the outlet port for liquid via a dispense tap to ambient. The dispensing liquid step includes a start dispense step in which dispensing commences and a stop dispense step in which dispensing is stopped.