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Message: [QUOTE="Ronfire, post: 390570, member: 9804"] I was wondering if adding an open layer below the pea gravel would help with the "plant filtering bog". It would allow the larger solids to settle out before entering the gravel. Might be counterproductive though as then it will not reach the plants. Good point is you could back flush to remove the accumulated derbies that gets past the filter screens. Bad point is you are creating pressure points holding up the gravel that could lead to a leak. Things to think about. [/QUOTE]