Timelaps video building the best pools in the world. San Juan Fiberglass Pools are 100% hand laid fiberglass. The length of the fibers is what builds strength in a fiberglass pool. When you “chop” a pool you cut the glass fibers into little pieces and blow them on the mold.
It’s kind of like concrete construction. We all seen that a black belt in martial arts can break a slab of Un-Reinforced concrete.
If you wanted to play a trick on him you could put rebar tied together in a tight grid and place it in the slab. He would probably break his hand as the rebar is to concrete as long fiberglass strands are to lamination.
If you weighed the rebar and found that it weighed one pound and made a third slab but this time cut up one pound of rebar into small 1″ sections and randomly sprinkled them into the cement slab the karate chop would bust it. It’s not that a slab needs steel, it needs steel in a grid like matrix, the same principles of physics apply to a San Juan fiberglass hand laid one piece Inground swimming pool.