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Message: [QUOTE="koikeepr, post: 25155, member: 1810"] That block has a little grip ledge at the bottom that supposedly can hold weight and locks them together, but that's meant to be supported with dirt behind the whole thing like in a garden setting. I've read the same mixed advice, chilligirl, but at the end most people support that kinda stone for fear of it busting. I would not trust that on it's own to hold in 5000 gallons of water personally. It's an enormous amount of push pressure. I'd have to add some kinda additional support to it or I would not be able to sleep at night. LOL! [/QUOTE]