Thanks Janet. That's what I am now wondering, since my cloudiness has turned greenish. I added a gallon last night, and my walmart kit is reading "at least" 5 (it's slightly darker yellow than that). How do I know if I am at 15-18? Add 2 more gallons and "hope?" This am my TA is down to 180 and the pH is 7.5 Should I add some more MA too?