Yes. 1st time I testedi gor 100. Tested again and tried to be so careful with that litle black dot...then about 80. Not diluted. We have been adding bleach 2x's per day, morning and night in the amouts that will bring it up to 25ppm. My son took over the testing for me as I became frustrated not knowing if I was doing it correctly. Watermom said to get the FC to 25ppm and get it to hold overnight and then for good measure keep it at that level for another day and then start backing off with the goal of maintaining 8-15ppm. I hope I am understanding this correctly. I will say that my pool looks sparkling and clear but I also understand this will be short-lived if I do not stick with the program. It needs a good vac but these 101 degree days are miserable! Thank you for your continued advice and support!