The pool in the house I bought 6 years ago was installed by Patio Pools. I think they have a good rep as a quality installer but beyond that they seem to be in business to sell you unnecessary chemicals and gadgets. My pool came with an ozonator, a pool frog chem system and a magnetic in line thingy.
They also used a computer tester which told me my TA was low when my testing told me it was high.
They also used a computer tester which told me my TA was low when my testing told me it was high.