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Thanks! At Amazon's $9/bottle that works out to 23 rez changes. Anyone ever do the calculations for Z7?If I remember correctly it's 5 Mills per gallon or one tsp. I put 2 - 5 mill spoons in my 1 3/4 gallon rez. It's been running 2 weeks and still looks clear. I'm going to change it out tonight. Hopefully. My little clones still look good so far