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公认的硬度划分是:- U6 H% z8 t& _5 _
Water containing calcium carbonate at
) {6 h+ j3 I3 ?5 Z$ ?concentrations below 60 mg/l is generally considered as soft; 60–120 mg/l,
- x6 D& c9 z. J4 S& V# Amoderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard
0 v+ X6 i4 t+ [* n, ], J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:; C5 t, y/ t" W
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.; M; r' b$ D0 D* ~7 t m
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。$ N" y& o- @" O6 o% y6 z& ^
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