I live in Minnesota and am installing a 22x50 liner pool. I've had four companies look at the project and they all have differences of opinion on how to sanitize it. I'm hoping someone can help explain the pros and cons from a neutral point of view, versus a pool salesman, on what I should use. Here are the options I've been given. All are Pentair projects as it seems like all pool companies up here use them. Thanks in advance for helping out the new guy.
1. IntelliChlor Salt Chlorine Generator
2. Ultra UV with Clear O3
3. Ultra UV with chlorine taps in the skimmers
4. Ultra UV by itself
For reference, I'm installing an autocover, using a pentair intelliflo pump, pentair 520 cartridge filter, and pentair 400 btu heater.