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公认的硬度划分是:
e2 _9 B2 x) J) R/ M" }) FWater containing calcium carbonate at
* r' G# c4 v5 o/ R$ b- Hconcentrations below 60 mg/l is generally considered as soft; 60–120 mg/l,
~' V% @" m& R5 |moderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard: w3 O( E" k5 i2 G' Z' s
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:- x( t" i' w1 x: }4 f8 h
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.
7 X# X+ @& l" J7 i4 d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。- a8 Z3 v7 @; t- u% H: Q; ]0 _
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