Taylor Drop Test Kit, Drop Test, Chlorine, FAS-DPD - .75 oz bottles

Taylor Drop Test Kit, Drop Test, Chlorine (free/combined), FAS-DPD, 1 drop = 0.2 or 0.5 ppm, .75 oz

In this Taylor FAS-DPD test, add an amount of buffered DPD powder to pool water to turn it pink. Then, add Ferrous Ammonium Sulfate (FAS) one drop at a time until the sample turns clear. 

The FAS-DPD titration method allows users to measure both free and combined chlorine at increments as low as 0.2 ppm - the maximum allowable level for combined chlorine according to most technical standards - and as high as 20 ppm.  Tests for free & combined chlorine are 1 drop = 0.2 or 0.5 PPM.