Should I be concerned with kids jumping on a fiberglass pool tanning ledge (impact)? I love the look of it especially with the fountain features... I considered concrete and decided to go with fiberglass. In my case it was a little more $ than concrete and after wading through (npi) all the pros and cons, decided on fiberglass. I'm considering a design with a larger ledge/seat shelf that is further below the waterline and will have seat jets. The builder also recommends against the in floor cleaning system because people could step on the cleaning heads and be prone to leaks?