I've been in the pool industry most of my adult life. Retired from it 7 years ago. I think fiberglass is an excellent way to go here in TV as long as you don't have any risk of an elevated water table. If the dirt that is excavated to dig the hole for the pool is a sandy composition it can be used to backfill the overdig as well. If it is very high in clay, rock or loaming organic material then all spoils will have to be hauled out and sand put back in as a base as wellas backfill. That procedure can get a little pricey. I believe most soil here in TV to depth you would be digging would be a perfect sandy/clay composition. Proper grading under the pool is paramount also proper compaction of backfill. In regards to San Juan, I was a dealer for many years, I finally dropped them because in my opinion they were the "Walmart" of pool companies. They became unethical with there dealers and would not offer any service after the product was sold. They only cared about volume and not quality or customer service. Maybe they have changed so I would just suggest you do your research. P.S. if you ever have to drain your pool take great care. Essentially it is like a boat and will pop out of the ground from a relatively small amount of hydrostatic pressure
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