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I am in the process of gathering pool quotes and have a couple of questions -

1. Is there any preference in concrete walls vs. an all steel construction (each would have a vinyl liner)
2. With a vinyl liner is a sand floor sufficient or should I try to get poolcrete or vermiculite. I heard of footprints occuring with sand bottoms - is this true?
3. Vinyl step vs. fiberglass - Any difference here or is this more of an aestehic preference?
4. One of my quotes has two main drains included, the other is 2 deep returns (no main drains). Again, is there any difference or is this 6 of one, 1/2 dozen of the other?
5. Is Polyfoam padding needed for either one of these types of pools?

Thanks in advance for your help.