Hi ALL,
Started lurking last year to resolve common problems. Now I have one I can't figure out so here is my first post.

I have a three year old 16X32 IG w/vinyl liner, about 25,000 gallons. My cover was ripped during a late winter storm so we opened to some nasty water. I had my original installer open and clean the pool because I wanted him to inspect for liner damage etc.

The water cleared up pretty good in about 5 days. I was testing with an OTO kit that only goes up to 3 ppm on TC. The water was testing off the scale for TC and PH was about 7.6. After another week the OTO tests were consistent with the first and the water looked great! I took a sample to my dealer for verification. Their tests show:

FC .2
PH 8
TA 180
Ca 190
CYA 30
Copper .01
Iron .1

I thought surely there was a mistake so the next day I had them test again with similar results. I picked up some test strips and they tested similar to the dealer.

So here is what I did. I started aerating, I added muratic acid over a two day period to bring the PH down to 7.2. I then added 4lb CYA trying to get it up to 55 and added 5 gal of 6% bleach to shock it. The dealer is closed so I can only check with my OTO and strips for now. I checked after 30 minutes. There is no FC according to the strips. It shows:

FC 0
PH 7.4
ALK 170
CYA 50-60

24 hours later tested the same.
Since the OTO is off the chart for TC, I diluted 1/3 pool water to 2/3 tap water (tested TC free). The OTO still tested above 3 ppm but the strips still show no FC.

Is it possible I actually have over 10ppm CC ?
The water looks and smells great.
My auto TriChlor Chlorinater is wide open, plus a few in the skimmer.
I have Ben’s new kit on order.

Any Ideas?
THANKS!