we have a pool in southern mexico that was built 8 years ago.it`s concrete and was painted with marmalena which is a ground marble mixed into the paint.it`s suppose to last forever but it`s time for a resurface.the pool is 15 x 5 x1.5 meters.so only one depth .i know a couple of people that have used regular floor tiles on the floor and walls.i would put the small pool tiles on the steps.slipping on the floor is not a concern because of the depth.whats the pros and cons?thanks