公开(公告)号：US20170319989A1

公开(公告)日：2017-11-09

申请号：US15146770

申请日：2016-05-04

Applicant: Ovivo Inc.

Inventor： Gary D. Haggard, SR. ,  Brendan Kelly

IPC: B01D24/46 ,  B01D24/22

CPC classification number: B01D24/4631 ,  B01D24/22 ,  B01D24/24

Abstract: Underdrain units in a sand medium or dual medium filtration system include efficient air, water and combined air/water cleaning. Air, water or both are delivered in backflow direction from a very low position on the underdrain unit, as well as water from a higher position, so as to effectively remove blocking contaminants on the outside the underdrain unit and in the surrounding filter media.

公开(公告)号：US10143944B2

公开(公告)日：2018-12-04

申请号：US15146770

申请日：2016-05-04

Applicant: Ovivo Inc.

Inventor： Gary D. Haggard, Sr. ,  Brendan Kelly

IPC: B01D24/46 ,  B01D24/22 ,  B01D24/24

Abstract: Underdrain units in a sand medium or dual medium filtration system include efficient air, water and combined air/water cleaning. Air, water or both are delivered in backflow direction from a very low position on the underdrain unit, as well as water from a higher position, so as to effectively remove blocking contaminants on the outside the underdrain unit and in the surrounding filter media.