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Message: [QUOTE="fishlips, post: 503281, member: 18976"] Aqua blocks support 5472lb per square foot your pallets are about 125lb per square foot so lots of big rock might be a problem. I keep looking at the 4 "thin" spots in the center thinking that is the weak points. If it fails rocks/children may fall in to your void space or held by the next one. I really don't know what would be best with or with out the blocks but limiting the amount of rocks to the load capacity I feel is the key to success If this was my project I think I would not use cinder blocks and only just enough rocks to hide the pallets and have plenty of strength left for kids to jump/play in the water with out any fear of collapse. Ask you self how much water will the value hold back will that amount of water be a problem flowing back? I Don't think so because a reservoir has to hold all the water of the feature when power is off. [/QUOTE]