Hozelock Limited

Kevin Ian Michael Marston

Andrew David Boddy

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

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Aylesbury, United Kingdom

Kevin Ian Michael Marston