A pool filter is for removing physical debris, it's not really for preventing bacterial or fungal infections. I guess what you're talking about is sanitizer, i

A pool filter is for removing physical debris, it's not really for preventing bacterial or fungal infections. I guess what you're talking about is sanitizer, in my case we use chlorine. I test it every time we swim, but I wouldn't have needed an LLM for that. It's very straight forward to maintain pool chlorine, my Dad taught me that when I was 13.