The HTH pool test strips are the perfect solution for maintaining your pool's cleanliness and clarity all season long. These strips test for chlorine, bromine, pH, alkalinity, calcium hardness, and CYA, providing you with the information you need to keep your pool in pristine condition. Simply dip the strip in the pool water and wait a few seconds for the results to appear. With compatibility for all pool types, including chlorine, bromine, and saltwater systems, these test strips are easy to use and provide accurate results. Plus, by texting a photo of your results to 484-123, you can receive customized pool care instructions from HTH. Each bottle includes 30 test strips for convenience.