| I found the article I referred to earlier, in Nichirin August 2002 and penned by Ken Sasaki a prof from Hiroshima University.
The data quoted shows an average hardness across mud ponds in Niigata, Hiroshima, Yamanashi and Kunamoto of 28.62mg/l. This is based on 10 different samples ranging from 4mg/l to 82.2mg/l.
The data for indoor ponds shows a average hardness level of 99mg/l across 21 samples. However, there are 2 samples from Nara region which are way above others as 462 and 200mg/l.
If we factor those out then we get an average of 73.72mg/l across the remaining 19 ponds.
Mark
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Mark Gardner
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