Hello all, great to be back after winter! I have a Taylor kit for high/low chlorine levels. I lost the instructions, and can't remember from last year. I know that you take a sample, I believe 10ml, add two scoops of th DPD powder, shake until dissolved. Now you count the drops of FAS-DPD Titrating reagent. Is each drop 1ppm or 0.5ppm?