Patent ID: 7638065

Claim:
A method of maintaining an effluent filter of a liquid treatment apparatus, the method comprising: arriving at an above-ground surface access point of a liquid treatment apparatus that is substantially located underground and that comprises a receptacle, an inlet, an outlet in fluid communication with the inlet, and a plurality of baffles configured to treat liquid at least in part by interrupting flow of the liquid from the inlet to the outlet; from the above-ground surface access point, detaching an effluent filter located inside the receptacle of the liquid treatment apparatus from an attachment point located inside the receptacle; pulling the effluent filter out of the receptacle; performing maintenance on the effluent filter; from the above-ground surface access point, inserting the effluent filter into the receptacle; and attaching the effluent filter to the attachment point; wherein the effluent filter is attached so as to form a single assembly with an outlet standpipe, detaching the effluent filter comprises detaching the single assembly of the effluent filter and the outlet standpipe, and attaching the effluent filter comprises attaching the single assembly of the effluent filter and the outlet standpipe.