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O que é DH?
Uma medida da dureza geral da água, expressa em graus (do alemão Deutsche harte). 1o dH é igual a 17,9 ppm. 0-4o é considerado muito macio, 4-8o macio, 8-12o médio, 12-18o bastante duro e 18-30o é duro-muito duro.
Sinônimos
Grau de dureza
Nome de termo em inglês
Degree Hardness (DH)