Source for TDS (total dissolved solids) calibration fluids?

treston

New member
Jun 6, 2006
7
0
Has anybody got a source for TDS (total dissolved solids) calibration fluids?

I can find bulk bottles of 1200ppm for use in hydroponics, but I have read I should be using fluid for salts usually found in coffee. Has anybody a good cheap source for suitable coffee calibration fluid. (or does anybody simply get away with other generic fluid).
 
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