| 摘要 |
<p>A filtering canister which contains a filtering medium of diatomaceous earth which is retained within the canister by a foraminous support consisting of a series of concentric truncated cones of foraminous sheet material and a fabric disposed between the filtering medium and the sheet material. The innermost cone is secured at its inner edge around a central vertical pipe extending through the cover which permits the recharging of the filtering medium. Hoops are provided to loosely retain the fabric in place in the vertices of the cones when flow is arrested.</p> |
