I have a 15,000 gallon fiberglass pool with spa. (CH 220-320) is what you guys recommened
I'm currently at 140 CH cause of 2 drain and refills.
220-320 is a big range, so what should i keep my CH at?
now the test kits says to add 2 extra drops if there is copper in the water? do I have copper? how much copper? to add 2 extra drops, doesn't all water have copper since it comes from a copper pipe?