I've read all the comments on the UV systems. I was looking at spectralight. I understand the need to still have the chlorination, etc. My interest in getting it is the brochure claims you rarely have to adjust the PH. I was wondering if that's true. I have a 20,000 gallon saltwater inground pool. I'm getting ready to close the pool for winter, but was thinking about it for this for spring when I reopen it. Right now I have to add 1/2 gallon of muriatic acid 2 - 3 times per week to keep the PH at a reasonable level. If the UV system would reduce that down to once a month or even less, then for my purposes, I think it would be worth it. However, if there is some reason it wouldn't be a good idea, I would appreciate all the input.