[Compatibility]Cat water fountain filters replacement set, perfectly for 84oz/2.5L wireless pet water fountain; [4 Level Filtration System]Replacement filters come with 4 layer filtration system] Non-woven fabric can filter hair and impurities, keep water clean; Activated carbon can remove and odor, purify and freshen water; Filtration stone can remove heavy metals and release trace elements; Ion exchange resin could soften the tap water, improve the taste. [Pre-filter Sponge]High density pre-filter sponge helps remove fine particles and filter impurities, preventing them from entering into water pump, it can help to extend pump life. [Replace Filter Regularly]To maintain the filtering effect, please replace filter and sponge every 2 weeks; Please clean the fountain and change filter more often if have multiple pets. [Warm Tips]Before replacing the filter, please soak filter for 5 minutes and thoroughly rinse it for before use, which will prevent carbon dust shedding into water, keep water clean. Product Benefits:Removes impurities Colour:Photo Color Material:Polypropylene(PP) Specification: 12pcs Package Contents: 12 x Replacement Filters 12 x Pre-Filter Sponges Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.