PoolSan 8in1 Pool Test Strips. Each bottle contains 25 test strips for the following parameters: Total Alkalinity, pH, Cyanuric acid, Copper, Free Chlorine, Total Chlorine, Active Oxygen, Total Hardness. These test strips enable you to check all the parameters in the water that you need to have peace of mind that your bathing water is safe and healthy to swim in. Compatible with the PoolSan.digital strip reader App. Suitable for use with both chlorine and/or PoolSan treated pools. Full instructions for use are on the label. Ensure your water readings are all within the normal ranges prior to swimming.