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As I understand it, Bil's brilliant slope microscreen prefilter is fed by a bottom drain 4 inch standpipe, it flows down across the self rinsing screen dripping down into the biofilter and the biofilter is pumped from the back. This creates an ever lower water water level from pond to screen chamber to biofilter, which is why the bottom drain water is welling up from the standpipe in the first place. Turn off the pump and all the water levels equalize and nothing happens.
So you want to drive air into the bottom drain standpipe to cause it to well up and return from the biofilter via gravity?
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