What to put between layer of sand and pool liner

welcome to TFP :)

Many of us have used the 3/4 inch foam from HD or lowes :) it works great

Shop STYROFOAM R5 Faced Polystyrene Foam Board Insulation (Common: 0.75-in x 4-ft x 8-ft; Actual: 0.687-in x 3.937-ft x 7.875-ft) at Lowes.com

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I have used Sand and the foam sheets. I prefer the foam sheets, it is great for a soft bottom that wont dent (kids love it), the sand worked good as well but not the sand is not soft like the foam. It is a personnel choice you don't have to put anything other than the tarp
 
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