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公认的硬度划分是:) J, p) I! D4 ]* G
Water containing calcium carbonate at* J- g( Q) Z" B. [2 `3 t* `7 S
concentrations below 60 mg/l is generally considered as soft; 60–120 mg/l,
( k8 H% G6 N( Y* f. I9 {* L: nmoderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard, o# V" E% ^8 {! Q" T! u
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:
' n9 h* }( A8 P; ]/ OMontreal 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.
2 I6 [' Y6 V4 d- q! n" b2 R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。% M' s' m) P8 k8 M
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