When a pool builder says stuff like that, maybe you need a different pool builder. If the Texas builders mess around with the concrete mix, consider a vinyl liner instead.

Ozonators have their own problems and I don't even want to get into them.

SWGs are used in every climate around the country with few problems. JasonLion has laid out the problem with in-line chlorinators.

Since you are new, read up on all our sticky posts on pool maintenance, and then go to PoolSolutions.com (our sister site) and read the tips there. It will help.