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Message: [QUOTE="lillysbaba, post: 312077, member: 5292"] If you want to filter the muck out of the water I believe that the dirty water needs to come from the bottom of the gravel so that the roots of plants in the gravel can use the waste for fertilizer. The water feed should also be run thru an H shaped system of pvc pipe with slits cut on the underside to distribute the water evenly. Nelson's Water Gardens in Houston TX has a website that had a diagram for waterfall filters and will be helpful if you need a phone consult. Good luck! [/QUOTE]