everyone kno what a "sump pump" is? see my thinkin is more simple is more better. ive cked out the plans for the DWC cited above and it looks lika lot of extra stuff (risers float valves and more work - which if your into is ok). but why not use gravity (elevate your buckets with a few blocks-bricks under your buckets) to drain back to a angled collection basin with a "sump pump" that shuts itself off then it starts sucking air pump your nuetas back onto the main tank. the only thing a need is the pump....and to tell ya the truth a aint seen one yet - any ideas??