We purchased a home with a pool about 3 years ago. Pool was 1 year old at that time. Have always had the guy who built/installed pool maintain it. Wanting to start doing it on my own now to save a little money. Currently, he's having me use Tri chlor tabs in chlorinator and dy-chlor for shocking. After initial opening (roughly 20 lbs of dy-chlor over several days) pool cleared up and remains clear today. However, I am concerned about not getting a reading for chlorine when testing. So I took sample to pool store and below are results:
I plugged all these into the pool math site and it showed I needed 2 jugs of 8.25 bleach to get FC from 0 to 12. We have 4 kids and had lots of swimmers yesterday so I put 3 full jugs (121 oz each) last night. Still tested 0 is morning. I am suspecting the issue is due to the high CYA and I may just need to drain half the pool?? Any advice would be greatly appreciated!