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公认的硬度划分是:
& j0 R1 M- ]3 F4 D& e# {Water containing calcium carbonate at
% P+ Z" m/ l; p' Z7 M7 A1 qconcentrations below 60 mg/l is generally considered as soft; 60–120 mg/l,
+ O( X0 ^( k& p% p4 d2 d+ a+ Smoderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard
3 M3 P9 K+ w8 G. k3 X' t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:& j, J/ c$ v8 @8 F3 `& v" D% A
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.
# ?0 N. `0 R9 W& t( w S! d/ E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。
# ^4 a) S1 b) T R7 C7 C9 N+ P; z. d9 I5 `! B" a( T7 ^
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