Leisure Time pH Balance Plus is a highly effective pH buffer that all but eliminates frustrating pH bounce, and is formulated specifically to resist changes when the spa is refilled with hard water. Its quick-dissolving granular formula can be added directly to spa water for easy application, and only requires 15 minutes of circulation with the jets on. It's even compatible with chlorine, bromine, and biguanide sanitizers. Best of all, pH Balance Plus is made to the ultra-high standards Leisure Time demands of all its products, allowing you to buy with confidence.