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Message: [QUOTE="Phaewryn, post: 472011, member: 11783"] If it's the type with lips, then I don't think it will work with geogrid, and you're just stuck to only building 4 high. I would go with doing that. Just reduce your height to the height the block manufactured recommends (I'm assuming it's 4 because those look like the kind sold at Home Depot and I'm pretty sure those say 4 high on the label). Call them and ask. Each block manufacturer has their own recommendation for max height for each type of block they make. Your pond depth can go deeper by digging out the lawn below, you don't need to make a tall wall to have a deep pond. [/QUOTE]