Relax Rapid Dissolving DPD No 3 test tablets to test for Total Chlorine (use with DPD No1) Relax.
Rapid dissolving test tablets sold in boxes of 100 tablets packaged in strips of 10 for long shelf life. DPD no1 and Phenol Red can be used with Chlorine/pH Pool Test Kit. Silver packet with green writing - rapid test tablets for manual comparison charts