Bestway Lazy Spa Filter Cartridge Lay Z twin Pack. Condition is brand New, sealed. They work by catching dirt and grime when the water is pumped through them. As your pump will usually be continuously cleaning and filtering the water when it is turned on, this dirt can quickly build up, especially when the hot tub/pool is regularly used. Dispatched with Royal Mail 2nd Class. Thanks for your interest any questions please contact me. L daikt
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