DPD 1 Tablets test the pool water for free Chlorine levels. DPD 1 Tablets should be used with a test kit designed for their use. Pentair test kits commonly use this technology for testing as an alternative to chemical reagents for testing pool water for Chlorine.
WARNING: The following product(s) can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov