is there any difference between vermiculite -cement and sand-cement pool bottom ? is it OK to use sand- cement mix instead of vermiculite?
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Vermiculite contains styrofoam balls that give it it's elasticity. This is necessary to give your pool bottom the flex needed when walking on pool floor. A hard surface would cut your liner.
No. A vermiculite - cement provides a stable surface for the pool bottom. An extra heavy spot loading on your pool floor will result in the vermiculite compressing slightly and distributing the loading so as not to, less likely, damage the floor. A sand - cement pool bottom, while not as rigid as a concrete slab, will provide a very stable surface but it will not dent to relieve a heavy spot load and damage to your pool surface is more likely. The vermiculite strength is not as great as a sand and therefore results in a softer yet adequately stable pool surface.
