Always wanted a pool and now we have one. Perfect size for my wife and I, 10,000 gal inground pool. Fiberglass. Had a local pool company service the pool, the same one the previous owner used. Well as I am learning, they are not so good. My pH has been less than 7 (6.4-6.9) since we bought it. Didn't know that was bad until recently. Replaced my filters, they had not touched them in years, oh and fired the pool guy. So now am learning. Purchased the PoolMath full app and am working to get the pool balanced. So far great information on here. My FC is high and not sure why so working on that. I have not purchased a pool text kit yet but was using the pool store. Then my CYA went from 5 one day to 148 the next and I didn't put anything in the pool except metal out. Not confident these guys are ANY good at this. Next purchase will be the pool test kit to do it myself. At least in Southern Mississippi I won't have to "close" my pool for the winter lol.