Compatibility6 Pack replacement filters, 6 Pack sponges and 6 Pack filter bags set is perfect for 230oz/7L dog water fountain; We provide 12-Month Replacement and 24-hour customer service, please contact us if you have any question. Mutiple Filtration FilterFood 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 & SpongeFilter 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 TipsBefore 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 RegularlyTo 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.