Have you only spoken to two poolbuilders? I know its nice to have a "snazzy" sales rep with the "cool 3-D" software that shows you what a pool can look like. But really - it sounds like the companies you have been speaking with are more interested in a sale than you having a good experience as a pool owner.
If a company doesn't want you to install a SWG - it might be because they are not familiar with them - I would never make a pool company install something they don't normally install.
I asked the pool companies I talked with which method they would recommend and why. I overwhelming got "ozone" from those who were running "specials" and I got "SWG or standard chlorine" from those sales reps that had pools.
If I were you - I would talk to a couple more builders and see what others are saying.
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