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公认的硬度划分是:
1 h/ c' l+ V5 y: P: fWater containing calcium carbonate at$ \* o$ M V2 z. C# q; `- ~4 U
concentrations below 60 mg/l is generally considered as soft; 60–120 mg/l,; ^4 f( u G1 {+ v/ h- u$ l
moderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard
0 z% U' X; f* i! ~( k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:% h* Q7 J3 I5 C$ k# b" x
Montreal 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.- Y# A7 j+ F! a4 e# }( O
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。8 f& }3 ~- _( r; b1 g8 y
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