Cyanuric acid is known also as CYA--it's the stabilizer that you need to protect your chlorine from the sun. It might be labeled cyanuric acid, balancer, condition, or stabilizer, but if you look at the ingredient list, cyanuric or isocyanuric acid is what you want. Muriatic acid is a very strong acid that is used to lower pH. You don't want that one, at least not for now.

Janet