So I just finished removing the sod for my 18 foot round intex gap. I am working on leveling now, but I need advice for cheapest layer of protection from the rocky clay soil. I plan on putting 2 tarps down over the soil once it is leveled before I put the next protective layer. Should I go with sand, foam board, or something else? I have already blown my budget so far so I need the cheapest option to keep my wife happy lol. I attached a picture of the spot for the pool. Thanks!
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