Patent ID: 8702995

Claim:
A container for releasing a microbiocide component in a liquid composition susceptible to unwanted microbial, growth, the container comprising: a casing, not part of an internal combustion engine filter housing, impermeable to a liquid composition susceptible to unwanted microbial growth, and defining a hollow interior, at least one opening through which liquid enters and exits the casing and a further opening spaced apart from the at least one opening; a microbiocide component located in the hollow interior of the casing; at least one liquid permeable element covering the at least one opening of the casing and spaced apart from the further opening which is not covered by a liquid permeable element, the at least one liquid permeable element being effective to provide for controlled release of the microbiocide component through the at least one opening into a liquid composition susceptible to unwanted microbial growth external from the casing; and a ball float valve including a valve housing secured to the further opening in the casing, the valve having an open position and a different closed position, the valve moves, while the container is immersed in a liquid composition susceptible to unwanted microbial growth and a liquid composition susceptible to unwanted microbial growth is present in the hollow interior of the casing, in response to the level of a liquid composition susceptible to unwanted microbial growth in the casing, between the open position to allow air to pass out of the hollow interior across the valve through the further opening and the different closed position to substantially prevent any flow of material from passing out of the hollow interior across the valve through the further opening.