Abstract: A computer system and method allowing a user to upload an image representing artwork into the memory of the computer system. Thereafter, after the image is uploaded and approved, the image can be made available for display to other users of the computer system and made available for sale as an original artwork, or sale as a reproduction using a print-on-demand (POD) process. In one embodiment, the computer system is a retail website that displays and sells images, such as posters, photographs, and artwork. The user is an artist who desires to upload their artwork to the computer system for inclusion in the artist's portfolio that is electronically stored by the computer system. Once the artwork is uploaded by the artist and approved, the artwork can is displayed to other users of the computer system and/or made available for sale using POD if selected by the artist and approved.

Abstract: A system and method for sorting and filtering products selected by a user. The products may be displayed on a graphical user interface, such as an Internet browser, on a user's computer. The user's computer is communicatively coupled to a web server that creates web pages in response to a user's request for display of products. The user can makes requests for the display of products, namely posters and artwork, framed and unframed. The user can sort the artwork by various parameters, including size, popularity, most recent, and availability. The user can filter the artwork by size and price options. The filter criteria selected by the user remains in force for the user during his or her entire session unless the filter criteria is modified.

Abstract: A filter assembly for filtering pond or aquarium water includes a container (1,2) with an inlet chamber (15) having an upstream region (36) and a downstream outlet (13) leading to an outlet chamber (22). A filter (16) is positioned in the inlet chamber (15) between the upstream region (36) and the outlet (13). In use, progressive clogging of the filter causes the water pressure in the upstream region (36) to rise until it reaches a predetermined threshold when a normally-closed relief valve (28,29) opens to allow water to pass from the upstream region (36) to the outlet chamber (22) without passing through the filter (16). The valve has a coloured valve stem (28) providing a visual indication that the valve is open and that the filter is blocked and requires cleaning. In one embodiment, the outlet chamber (22) contains a source (19) of ultra-violet radiation to which the flow of water is exposed, regardless of whether the valve (28,29) is in the open or closed condition.