Relatively new pool owner here. Moved six months ago, house came with pool and existing pool service. Water has looked and felt good all that time although I have no measurements. I did notice there was/is white scale at the waterline since I moved in.
Pool service quit a couple weeks ago. I figured I could take over myself, how hard could it be . After several days procrastination ordered the Taylor 2006 test kit which being I'm in Hawaii came just a couple days ago. I also filled up the existing but empty Hayward CL220 chlorine feeder with trichlor tabs, which I now fear was a big mistake.
Pool still looks clear and sparkly to me. But here's my first ever set of measurements:
CYA 240 (measured by diluting 2:1)
So I'm thinking I need to drain and replace at least half the water, maybe twice over. Before I do that I've got a couple concerns:
1. Being that water still looks good, should I be concerned that maybe I'm just screwing up the measurements? I've done the CYA test 3 times over and always with the indication that I'm way over 100. It seems like a straight forward test but are there common errors?
2. Is it possible I sent the CYA this high just by the single load of that chlorine feeder? Or was it maybe already pretty high even before but there was just no way for me as a pool user to know?
3. Anything else I need to be concerned about before I replace some of the water?
Thanks for any suggestions!