I have just jumped into the pool game with the house I purchased this week. I'm fighting a green pool with the advice on this site. I purchased a FAS-DPD Service Test Kit today. I'm trying to shock the pool now, but how do I test for FC levels above 10ppm. The kit only seems to go to 10ppm. I guessing since you put in 5 drops of the reagents for the 1-10ppm range I should only put in 4 drops to get the 10-20ppm range. Someone please if I'm wrong.
Thanks for the help