Nyob rau hauv dej haus, hardness yog nyob rau hauv ntau 10–500 mg ntawm calcium carbonate ib liter (3). Kev kwv yees noj txhua hnub ntawm 2.3 thiab 52.1 mg ntawm magnesium nyob rau hauv cov chaw mos- thiab cov dej tawv, raws li cov neeg laus haus 2 litres dej ib hnub (4).
Yuav ua li cas cov dej haus yuav tsum yog hardness?
Hardness theem nruab nrab ntawm 80 thiab 100 mg / L (raws li CaCO 3) feem ntau suav hais tias muab qhov sib npaug ntawm kev xeb thiab incrustation. Cov dej uas muaj qib hardness ntau tshaj 200 mg / L yog suav tias yog cov neeg pluag tab sis tau txais kev zam los ntawm cov neeg siv khoom.
Dab tsi yuav tsum yog qhov nyuaj ntawm cov dej haus hauv ppm?
Feem ntau, cov dej uas muaj tsawg dua 60 ppm tuaj yeem suav tias yog mos, dej nrog 60-120 ppmnyuaj, thiab dej siab dua 120 ppm nyuaj.
Qhov kev txwv ntawm hardness yog dab tsi?
limit for hardness is 300 to 600 mg/L.
Dab tsi yog qhov zoo tshaj plaws ppm rau haus dej?
Raws li EPA cov kev cai haus dej thib ob, 500 ppm yog qhov pom zoo ntau tshaj ntawm TDS rau koj cov dej haus. Ib qho kev ntsuas siab dua 1000 ppm yog qib tsis zoo ntawm TDS. Yog tias qib siab tshaj 2000 ppm, ces lub tshuab lim yuav tsis tuaj yeem lim TDS zoo.
