I tested this morning and I am getting a dark orange color when i do. All of the bleach I have been using is Wal mart 6%. That was the past two days. No difference. I put 5 lbs of trichlor in last night. No difference. But the chlorine levels are high and i do only add in the evening. Waiting on a good kit to be delivered but the cheap test strips are saying that CYA is 0, but I know how inaccurate those are. So when you say keep levels at 15ppm does that mean AT or above or does it matter?