The Pentair 4-in-1 Chlorine & Bromine Test Kit includes DPD no. 1 and no. 3 tablets, solutions no. 2, no. 3, no. 4, no. 5 and a wide lucite test cell. Maintaining proper water balance allows for a safe and clean swimming environment. Easy to follow instructions allow for hassle free testing. Pentair testing kits and chemicals are manufactured under the strictest quality control standards in a laboratory staffed by certified chemists where all test solutions are formulated and packaged. To guarantee reliability, test reagents should be replaced annually.