Sand filters have served pool users for decades. But in-spite of the fine granular sand filtering medium resisting the flow of impurities, fine dust particles still are allowed to escape in the pool water. Changing the laterals, standpipe, and replacing the spider gasket do not serve the desired results. Moreover, it is a massive filtering system and covers a huge space. In order to overcome this problem, cartridges are built in conformity with the latest in technology and making use of fibrous filam [...]

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