| 摘要 |
1524581 Active carbon filters SOC PICA 28 May 1976 [30 Mayl975] 22424/76 Heading C1C Filters used in water purification comprise a chamber filled with a number of layers of different active carbons each layer being superimposed upon the other in order of increasing apparent density from top to bottom without any intervening material between adjacent layers of active carbon, each of which has the same particle size range. |
