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公认的硬度划分是:$ |) h2 d6 K' F: z
Water containing calcium carbonate at
& o, {1 E( J P' t8 F) @concentrations below 60 mg/l is generally considered as soft; 60–120 mg/l,9 n, E) s8 }( ?8 U, \/ s/ s+ a
moderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard' o" e3 o! z* y+ c( _6 Z
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:7 d7 m2 d- `. r* B" u2 \' 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.
! a' `) N- E7 K: 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。: m/ J) N7 r7 }$ |9 e, j7 A5 S* P
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