Watermom, thanks for ringing in on my post!
I had to go back and take a 2nd look @ the containers my chlorine tabs came in. When I first purchased the home 2 years ago I inherited my Doughboy pool. My pool had originally been on bromine for sanitation. I drained and refilled my pool and started using Trichlor-triazineirione tabs after that. Some where along the way I had purchased 15 pounds on Cal-Hypo. I had quit using all the tabs when my CYA reached 50ppm and switched to the BBB method.
I installed a cover for the first time last November and I pulled my cover off in the middle of July, add when I tested the water I found the CYA was gone. I ran the CYA test 3 time and same results, O ppm CYA. I thought I would use the tabs I had left over from two years ago to reintroduce CYA into my water. I have used about 6 pounds of Tri-Chlor I had left and the started using the Cal-hypo. Sorry for the confusion. I assumed wrongly both types of tabs contained CYA.
Anyway when I used up the Tri-Chlor I had about 4 days ago and my test @ that time showed 30ppm CYA. I started aerating last evening and checked my PH and TA again @ 2:00pm central time. My latest test show PH 7.6 and TA 100ppm . At this point do I need to add CYA powder/granules to 80ppm before I start my SWCG for the first time?
I do still have brown scaling on the bottom of my liner where it makes the transition to the wall. This showed up after last winter with a cover on or the first time? I have read on the Forum about possibly some metal getting into the water? Any ideas about that? Thanks again !!!