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Message: [QUOTE="GBBUDD, post: 464400, member: 10026"] The idea with using pea stone or river rock is the round edges and it allows fir some flow and for the most part won't trap sediment. Id look at building a new bog.. The stainless was just the quick easy solution to maximize the available amount of space. even 4 inch concrete block closes the space 1/3 but a 8 inch x 18 inch channel will do its job its a question of is it able to handle the load of the pond. I know there is rock i can get here in the states that comes from india thats a river rock. And id image there is 3/8 or even 3/4 inch river rock thats native to an area around you . Will your example work i would say yes .for a while anyways. It may start to clog over time its hard to say i never used it myself . [/QUOTE]