Abstract: The method is used for performing a cleaning operation on a water filtration device having an inlet, a concentrate outlet, a permeate outlet, a filtration membrane between the inlet and the permeate outlet, the filtration membrane filtering water under pressure during a filtration operation of the water filtration device, and a recirculation line leading from at least one of the concentrate outlet and the permeate outlet back to the inlet. The method generally has a step of performing the cleaning operation including recirculating a solution along the recirculation line, the solution having at least water and one cleaning agent, the step of recirculating including maintaining a circulation of the solution along the entire length of the recirculation line.

Abstract: A storage case (1) for a compact disc (2) comprises an outer shell (4) within which an inner carrier (5) for storing the compact disc (2) is slideable between an open and a closed position. The compact disc (2) is stored in a disc storing area (20) between a lower support plate (15) and an upper retaining member (19) of the inner carrier (5). Guide plates (25, 26) slideably guide the compact disc (2) into and out of the disc storing area (20). Resilient disc engaging clips (30) on a rear end wall (17) of the inner carrier (5) resiliently urges the compact disc (2) against corresponding abutment members (33) on the front end wall (16) for securing the compact disc (2) against sideward sliding from the disc storing area (20). The combination of the disc engaging clips (30) and the guide plates (25, 26) avoid the need for a central locating spigot for engaging a central opening of the compact disc (2).