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Too much will make the patch weaker than you want, but not dangerous to the liner since the concrete is weak and will compress. Not enough vermiculite could For most concrete and vermiculite floor pools this is not a huge problem unless you leave the pool empty during periods of freeze and thaw, or high waterConcrete is cheaper than vermiculite and more efficient. Because it is delivered already mixed, there are no dust or bags, making clean up a snap.