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[APD] RUGF versus UGF

T. Barr said: "I've had RFUG's for 10 years with plants."

Why a RUGF versus a UGF?

Just curious since I recently installed a version of a UGF in my 90 - Perforated PVC pipes under a sheet of plastic insect screen under the substrate, piped back to a submersible pump that is pulling the water down through the substrate. I could reverse that flow to push water up through the substrate, but why?


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