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I read somewhere on a previous post that the powder may clump up do to moisture, and if this happens you should crush it back up prior to using it. Could this be what is happening with your powder and causing you to add more to get an accurate reading?

Jason, Please define "signifcantly better" & when you say hundreds of dollars, can you be more specific and a give a product example. I too am one that really strugles with the accuracy of the black dot test.

Ok new pool has been up and running for about two weeks now. The water looks great. Clear as bell. I am however having some concerns with my numbers on a day to day basis. Here are my current numbers (TF100) FC 4 CC 0 PH 7.5 TA 100 CH 200 CYA 40 ???? Start up water was high...