When starting up a new plaster pool, the "pool school" section says to add some sequestering agent. So I did.. but is there any way to test to see if it's needed on a monthly basis? I'm all for preventative maintenance, but I'd rather not toss $35 a month into my pool if there aren't any metals to begin with.
Also, I've also noticed that other than a few instances, there's really not that much info in "pool school" on sequestering agents. It's taken me forever to figure out what it is and what the active ingredients are so I can see if the stuff on the shelf called "Scale Free" or "metal out" or "Magenta stuff" or.......??? is the sequestant that I was told I needed. Maybe one of the site administrators could update the "Definitions & abbreviations" section and the "Recommended Pool Chemicals" section.