A filter for mechanical removal of undesirable fine particles, algae and similar small cells from flowing or standing water, through which extracted water (optionally in the form of a partial stream) (2) is passed, followed by recycling the water, contains one or more filtration membranes (3)...
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Pond or aquarium filter for removing very fine particles and cells and algae from water, optionally as a partial stream (2), has one or more membrane filters (3) with a pore size no greater than 1 micron.