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Old 07-18-2007, 02:42 PM
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babygro
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Quote:
Originally Posted by hmman View Post
so by grain hardness you mean hard or soft water? what's better?
Grain hardness is a measure of the total dissolved solids (TDS) contained in the water. The lower the grain hardness, the lower the EC, the lower the total quantity of TDS, and vice versa for higher figures.

Yes, bottom line is how hard or soft the water is.
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