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METHOD OF AND APPARATUS FOR PURIFYING LIQUIDS IN A FOUR-STAGE TREATMENT PROCESS WHERE THE TREATMENT TAKES PLACE BY MEANS OF MAGNETIC FIELD, CERAMIC FILTERS, FERROMAGNETIC ION-EXCHANGE BED AND ACTIVE CARBON BED
METHOD OF AND APPARATUS FOR PURIFYING LIQUIDS IN A FOUR-STAGE TREATMENT PROCESS WHERE THE TREATMENT TAKES PLACE BY MEANS OF MAGNETIC FIELD, CERAMIC FILTERS, FERROMAGNETIC ION-EXCHANGE BED AND ACTIVE CARBON BED
