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公认的硬度划分是:+ H& u- G% ^) }
Water containing calcium carbonate at
8 ~) K3 C5 Z- F$ e: i. x4 \concentrations below 60 mg/l is generally considered as soft; 60–120 mg/l,% h, `5 u( y" A0 f$ v8 W+ r
moderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard. q( |! O) P( {# H" ~9 Z
爱城的水硬度在150-160之间,属于硬水,但不算很硬。这种硬度的水不需要在水厂进行软化处理,适当硬度的水对健康不但无害,反而有益。以下是加拿大主要城市水硬度指标:
- O* b, k9 ^5 `0 }' rMontreal 116 ppm,Calgary 165 ppm, Regina 496 ppm, Saskatoon 160-180 ppm, Winnipeg 77 ppm,Toronto 121 ppm,Vancouver < 3 ppm, Charlottetown, PEI 140–150 ppm, Waterloo Region 400 ppm, Guelph 460 ppm.
- |- N! @/ J5 Q1 N' L在家里根本不需要安装什么软化水装置,而且都要把水烧开的做法也不可取,钙和镁都沉降了下来,其实这两种元素都是身体需要的,直接喝冷水最好,如果肚子能适应的话。; V" g! w6 M4 M: O! F; s- |
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