DPD 3 Chlorine Testing Tablets - 1x sheet of 10 tablets
DPD 3 tablets are used for testing chlorine or bromine levels using a 2-in1 or 4-in-1 test kits.
Each sheet contains 10x tablets.
DPD 1 tablets (available here) are used to measure the free or 'available' sanitiser levels.
DPD 3 tablets are used to measure the total chlorine or bromine after the free level has been tested.