Application of dyestuffs to textiles, paper, leather and other materials (1920)
Matthews, J. Merritt (Joseph Merritt), 1874-1931 · New York, Wiley · leaf 122
for the purpose of removing suspended and organicmatters. In the Permutit process a form of pressure filter is used employ- PURIFICATION OF WATER 103 ing an artifical zeolite as the filtering mechanism. This mineral has thepeculiar property of exchanging its sodium content for calcium or magne-sium… … Fig. 91.—Water Softener. (Booth System). zeolite and receives in exchange a corresponding quantity of sodium, sothat in place of calcium sulphate the water will come from the filter con-taining an equivalent amount of sodium sulphate. By this processwater of zero hardness may readily be obtained.…
Dyes and dyeing · Textile fabrics
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