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公认的硬度划分是:- Z) m; \5 w- e$ O& c
Water containing calcium carbonate at
% q M5 t* P% D& iconcentrations below 60 mg/l is generally considered as soft; 60–120 mg/l,& `7 h( V# i5 @* k" X6 j
moderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard
4 i6 s- M4 d) P$ A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:
8 u, E8 @9 F. y$ o" \) lMontreal 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.
^9 U1 x1 M1 O' |+ O0 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。
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