QUOTE (jschoenith @ Feb 26 2009, 01:10 PM) the difference of pressure between the vase and the bowl will effect the pull of the overall system and so will the bowl size and id what about putting on some type of floater/one way valve? Like at the end of the downstem, a small floating plastic ball or something, simular to the valve on top, but it floats up and blocks the water from going back up the down stem. That way you could have a longer downstem and more filtration right?