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Old 02-03-2005, 10:50 AM   #10 (permalink)
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Originally Posted by tsunami
Perhaps Ca/Mg relationship is the culprit and not actual hardness? Hmm.

That's what I was thinking as well. Separate accurate measurements of Ca/Mg require expensive kits, so I am not sure what exactly the values are in my tap. I am also doing an experiment with partial RO with small Ca addition to see how it turns out for me, so it will be softer water with higher Ca/Mg ratio(actually it might be any other elements in tap water, like Ca/TDS? because some people report Ca/K also matters, but not in my case). But it is a low tech tank w/o CO2 so it would take a long time to see the effects.
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