| 摘要 |
Filter for the desalination of water. This comprises a series of coaxial cylindrical pipes 1, 5, 7 and 9 whose walls include multiple perforations 2 which decrease in size in an inward direction and whose internal surface is covered with a sheet 3 of glass fibre soaked in white cement and powdered marble, these chambers being closed at the top and communicating below, while the central pipe 9 is hermetically sealed at its lower end 12 and forms the outlet 13 for the filtered water. In addition to this, a filtering mixture based on granulated marble or powdered marble, stucco and/or stucco cement, white cement and glass fibre is also located in the said chambers 6, 8 and 10.
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