US 11,879,236 B2
Intake filter for water collection system with pressure activated backwash valve
Christopher Roy Thompson, Barrie (CA); and Michael Nelson Pereira Caldeira, Toronto (CA)
Assigned to GREYTER WATER SYSTEMS INC., Toronto (CA)
Filed by Greyter Water Systems Inc., Toronto (CA)
Filed on Jan. 29, 2021, as Appl. No. 17/162,684.
Application 17/162,684 is a continuation of application No. 16/078,250, granted, now 10,934,691, previously published as PCT/CA2017/050283, filed on Mar. 2, 2017.
Claims priority of provisional application 62/305,625, filed on Mar. 9, 2016.
Claims priority of provisional application 62/302,988, filed on Mar. 3, 2016.
Prior Publication US 2021/0148095 A1, May 20, 2021
Int. Cl. E03B 1/04 (2006.01); C02F 1/00 (2023.01); E03D 5/00 (2006.01); B01D 29/66 (2006.01); B01D 35/143 (2006.01); B01D 35/147 (2006.01); C02F 1/28 (2023.01); C02F 1/44 (2023.01); C02F 1/68 (2023.01); C02F 1/76 (2023.01); C02F 103/00 (2006.01); E03C 1/26 (2006.01)
CPC E03B 1/042 (2013.01) [B01D 29/668 (2013.01); B01D 35/143 (2013.01); B01D 35/147 (2013.01); C02F 1/001 (2013.01); C02F 1/008 (2013.01); C02F 1/283 (2013.01); C02F 1/44 (2013.01); C02F 1/686 (2013.01); C02F 1/76 (2013.01); E03B 1/041 (2013.01); E03D 5/003 (2013.01); C02F 2103/002 (2013.01); C02F 2209/03 (2013.01); C02F 2209/40 (2013.01); C02F 2209/42 (2013.01); C02F 2303/16 (2013.01); E03B 2001/045 (2013.01); E03C 1/26 (2013.01); Y02A 20/148 (2018.01); Y02A 20/30 (2018.01)] 7 Claims
OG exemplary drawing
 
1. A method of filtering grey water comprising steps of,
filtering influent water from a shower or bath through a filter element;
monitoring one or more sensors located upstream of the filter element or in a by-pass around the filter element to detect a) the presence of a hold-up volume of influent water upstream of the filter element selected to indicate a decline in filter element permeability or free surface elevation of influent water upstream of the filter element selected to indicate a decline in filter element permeability or b) water by-passing the filter element;
cleaning the filter after the selected hold-up volume or selected free surface elevation is sensed, or after water by-passes the filter element, wherein cleaning the filter comprises flowing water through the filter in a reverse direction and contacting a flapper valve with the flowing water.