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Message: [QUOTE="Jhn, post: 455716, member: 9612"] Had an 18” gravel manifold bog for 10 years and had no issues with it other than it being undersized for my pond and stocking level. So, I enlarged it and redesigned into a water matrix block/snorkel/centipede bog, this lets the fines settle out into the snorkel and can be pumped out as needed, so not really worried about channeling happening in it. Been keeping ponds this way a loooong time, using bogs and plants as the filter and have never had a fish die off or any issues for that matter. [/QUOTE]