Hi ther MethodAgent
Welcome to TFP!
First, let me ask- why did you drain and refill the pool? What problems were you having?
Why did you use a sequestering agent?- what were you using it to avoid problems with?
Use Muriatic Acid to lower your pH. I'd take it down to 7.8 as a start.... better to lower in increments as 8.2 being the highest end of the scale on those testers, you might actually be higher?? Use PoolMath (either the phone app or the classic web version found at the bottom of this page) to tell you how much muriatic acid to use.
PoolMath
As you lower your pH, it will help lower that high TA also. A side win!
Again, use PoolMath to tell you how much LIQUID chlorine to add to bring your FC up to aprox 5ppm. That is the amount that correlates with 30ppm of CYA.
FC/CYA Levels
Are you using a SWG? If so take your CYA up to aprox 70ppm and take your FC up using liquid chlorine agagin also based on this chart, then let the SWG take over and maintain the FC.
The Fusion device is adding metals to your water- did you know that?? We advise folks to remove the metals portion.
More questions?? Holler
Maddie