A liquid flow generation apparatus (100) comprising a working chamber (105) and a corresponding drive region (106) for holding liquid from a liquid source (800); a conduit (120) and a check valve (110) fluidly coupled to the drive region (106); an intermediate tank (125) located at an elevated position, configured to receive and store the held liquid from the working chamber and to discharge the stored liquid in response to the stored liquid exceeding a first threshold volume; a drive member (115) operable to reciprocate through a push stroke, in which the drive member (115) moves from a first position to a second position to drive the held liquid from the drive region (106) through the check valve (110), and a pull stroke, in which the drive member (115) moves from the second position to the first position to allow flow of further liquid from the liquid source (800) into the drive region (106); and a reciprocation tank (140) having a tank weight smaller than the weight of the drive member (115), the reciprocation tank (140) cooperatively connected to the drive member (115), configured to collect the discharged liquid from the intermediate tank (125) to increase the tank weight to cause the drive member (115) to perform one of the push and pull strokes, and to release the collected liquid in response to the collected liquid exceeding a second threshold volume to generate a liquid flow and to cause the drive member (115) to perform the other of the push and pull strokes.
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