WOW......I was just reading about this........
I think it has to do with the fact that there is not enough CO2 in the water for the kalk to completly react with....... I will go and see if I can find what I was reading........
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Richard
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My wife believed me when I told her it was only going to cost about $500.00. that was over two years ago and I'm still grounded..... 
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