Aqua Select® Phenol Red 1/2 Oz. Refill

This ½ oz bottle of Phenol Red checks your pool water's pH level. Phenol Red is a reliable liquid test solution that accurately measures the pH level of your pool water. With just a few drops, the solution will change color, indicating whether your water is too acidic, too alkaline, or perfectly balanced.

Note: An ideal pool water pH level is between 7.2 and 7.8