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公认的硬度划分是: t" u, g; [) \5 p# V# v$ I
Water containing calcium carbonate at
5 O2 k, t2 l0 g& ~concentrations below 60 mg/l is generally considered as soft; 60–120 mg/l,8 x9 b* v7 L! U2 U- \0 q0 W
moderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard
: b! @: l7 ~) j+ C# F( b h' g8 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:& h4 V' R6 W+ L9 [4 i+ d2 j
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.
* s. w6 q# x) M- q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。
( \6 b& z9 p6 s7 M: |5 z6 s; D7 a' }& s- [: d5 P0 _
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