My CYA levels have been low or just within limits for months. This of course has a negative impact on my chlorine levels -lots of sunshine in the summer. I found Muriatic acid in Lowes & I used that a few days ago. It seems it's not the same as CYA... I tried to read my CYA level with the TFP kit. It's zero now. Is there another test for Muriatic acid? Do Muriatic acid and Cyanuric acid do the same thing?