Resumen

JULIAN-SOTO, F.. Water Hardness as Basic Indicator the Presence Fouling in Domestic Sanitary Facilities. Ing. invest. y tecnol. [online]. 2010, vol.11, n.2, pp.167-177. ISSN 2594-0732.

The monitoring of the water quality was done in the central valleys of Oaxaca state, finding very high concentrations of calcium, magnesium and carbonate in the waters from of deep wells that are located in the periphery of the river Atoyac, unlike the water that comes from the high parts of Etla valley, where there are maximum hardnesses of 140ppm, so for the distribution of both effluent to the city of Oaxaca and neighboring municipalities, suggesting a further dilution of the water treatment plant in "Fortin" in the city of Oaxaca, that after determining the Langelier index and other, with software found in the universal bibliography. The results indicate that water from the river Atoyac, have corrosive properties. In laboratory doing tests, the best dilution was 60 to 40% by volume, of water from Etla Valley and the periphery of the river respectively. Langelier index was converted to a negative, indicating saturation with respect to calcium carbonate (CaCO3) and will tend to dissolve, avoiding the deterioration of the sanitary units.

Palabras llave : Water; dilution; incrusting; hardness.