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Old 05-06-2008, 09:14 AM   #7 (permalink)
Left C
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Quote:
Originally Posted by ColeMan View Post
So Tom Barr says on a thread in which I inquired about buying a good test kit:

"Do yourselves a favor, make some reference solutions.
Make a set of ... KH(17.86ppm, 71.44ppm) ...
Bill would probably make these KH reference solutions for you. http://liquidarthome.net/khstandard
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