Also, a quick question. After being in the pool yesterday for the first time we noticed alot of low places in the floor of the shallow. Like indentions or small hills and valleys about the size of your foot all across the floor. Basically like its not completely flat and definitely not level across there. Not even close. I know he used vermiculite concrete mix under the liner which is pretty soft and porous so will the weight of the water even all this out? I was pretty surprised that they spent almost 2 full days sanding this thing down and it never got level. Its the first thing I'll be talking to him about Monday. Just wondering if this is normal? If not, it seems like we need to get this fixed before he goes any further.