When pool water is unbalanced, sanitizers can be less effective and your skin and eyes can become irritated. It can even damage the pool's surfaces or equipment if left untreated. Quickly and easily test your indoor and outdoor swimming pool water with HTH® multi-purpose six-way test strips. These strips test for free available chlorine (FAC) or bromine, pH, total alkalinity, total hardness and cyanuric acid (CYA). Best of all, these test strips for swimming pools work with chlorine, bromine and saltwater pools.