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Comment by Alan Barnett on July 29, 2015 at 1:47pm

I built this deck over a retaining block wall to make it easier to walk from the fishtank to the grow beds.  A recycled carport frame provides the support I need for the shade netting.   Each grow bed is about 150 Gallons 32"x96"x12".  It takes about twelve 50L bags of hydroton to fill them.  I am using a bell syphon with a 1 1/2 inch standpipe.  It drains quickly