This week on #PoolGuys we're discussing why we use vermiculite (aka: palmetto pool base) on all of our Radiant Pools (In Ground, Semi- Inground, Above Ground); Vermiculite provides a level of Hardness as well as Flexibility. We prefer it because unlike concrete which can crack at the slightest shift of the ground under the pool, vermiculite provides the versatility to work with those shifts without compromising the shape and stability of your pool's core base below the liner. | American Pool & S