The liquid transfer system (10) includes a liquid supply tank (14) and at least two pressurizable liquid holding vessels (34, 42). The liquid holding vessels (34, 42) are placed beneath the supply tank (14), and a liquid supply line (20) connects the supply tank (14) to each vessel (34, 42). The liquid supply line (20) is operated as a siphon from the tank (14) to each vessel (34, 42), in order to move liquid from the tank (14) to each vessel (34, 42). Each vessel (34, 42) is alternately filled and pressurized to dispense liquid from the vessel (34, 42) such that one vessel is being filled while the other is dispensing liquid, and a constant controllable liquid output flow is achieved. A preferred embodiment includes a liquid recycling line to recycle or constantly move the liquid within the system (10) to achieve thorough mixing, and an in-line filter to improve liquid purity.