[ Mutiple Filtration Filter]Food grade cat fountain filter has 5 layer filtration system, high density cotton filter out particles and debris; Activated carbon can absorb odors and impurities, purify and freshen water, to reduce the risk of urinary tract infections and kidney issues. [High Density Bag and Sponge]Filter bag can filter out hairs and large impurities, can enhance the filtering effect of the filter; High density sponge can prevent debris from entering into pump, to extend the life time of your pump. [Warm Tips]Before replacing filter, please soak the filter into clean water for 2 minutes, then rinse filter thoroughly, which will prevent carbon dust from shedding into water, keep water clean. [Replace Regularly]To maintain the filtering effect, you need to replace filter, mesh bag and sponge every 7-12 days; If you have multiple pets, please change the filter and clean the fountain more often. Material: nonwoven fabric colour: white Package Contents: 12 x Filter Elements 12 x Filter Cotton 12 x Mesh Bag 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.