Picked up double walled storm drain tile to make as close as possible to a maintenance free area for a bog. I have seen many be successful with 2" pipe and 3/8" pea stone and have no issues for a few years. I do plan on using this in the pond to feed one area or aquatic plants.But the main bog will have larger stone 6"- around a centipede for about 8" above the centipede. with 1 and 2" river rock on top of that with 3/4 stone and finally some 3/8 stone to finish. included in the picture is one of the three pieces to make the home made centipede. What I like about this area is the sediment will have a good deal of time to be able to have a chance to settle and not be forced directly up in to the bog and the roots. No to mention I need fill to build up the falls and bog area and this will fit both bills.
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