not replated to polution - it is the 'hardness' of water

送交者: meiyou 于 2008-10-29, 15:02:44:

回答: depending on where you are 由 habpi 于 2008-10-29, 14:27:18:

Check the marks left on the shower door - if you see the whitish mark soon after you cleaned - you know you have hard water which tend to cause kidney stones.

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