• Compatibility: Cat water fountain replacement filters and sponges set, perfectly for 135 fl oz/4L wilreless cat water fountain
• Triple Filtration System: Cat water fountain filters come with 3 layer filtration system, high density cotton can fliter hairs and debris, keep water clean; Activated carbon can remove chlorine and odor, purify and freshen water; Ion exchange resin can filter heavy metals and improve the taste
• Filter Sponge& Pump Sponge: High density pre-filter sponge can further filter out impurities, fully leverage the filtering effect; High density pump sponge can filter impurities, preventing them from entering into water pump, it can help extend pump life
• Replace Filter Regularly: Suggest replacing the filter and sponge every 2 to 4 weeks; Please change them more often if have multiple pets
• Warm Tips: Before replacing the filter, please soak the filter for 5 minutes and thoroughly rinse it before use, which will prevent carbon dust from shedding into water, keep water clean