These Borate test strips created by Aquachek are Total Hardness test strips that measure borate up to 80 ppm. Borate is used in conjunction with sanitizers to kill bacteria and inhibit algae growth in your pool or spa water. Borate's are found in products such as ProTeam Supreme, Bioguard Optimizer Plus and other similar products. Test results with just one dip and in just seconds! Simple directions for usage: Dip a strip into the water and remove immediately. Hold the strip level, pad side up, for 15 seconds. Compare the Borate test pad to the color chart on label. It offers enhanced colors for greater color distinction and easier readability. Features: Easy to use and maintain your swimming pool or spa Takes about 15-30 seconds to show results Instructions and chart on the back of the bottle Test for Borate