I've been trying to lower my TA. It is holding at 100 for some reason. PH is right at 7.5, CYA is at 60 and chlorine is at 8. The pool is a vinyl 32k inground with a sand filter. We just had the liner replaced this spring. Ever since then I can't seem to get the TA down. I've used Muriatic acid at suggested amounts according to the pool math app and no change. I even tried adding just a little more but no luck. Any suggestions? We have had a lot of rain here this summer. But I never had this problem before with wet summers. Is there a difference in Muriatic acid from brand to brand or store. I have been getting mine at Lowe's.