Recommended to replace the carbon filter every 2-4 weeks and the water pump filter every 1-2 months

erfect MatchSponge foam filters are specially designed and compatible with 2L cat water fountain compatible with AONBOY F2 cat water fountain and others of the same size Please check the size before purchasing Quality MaterialThe cat fountain filter is made of sponge offers good filtration to the pet water fountain brings clean and fresh water to your pets which makes your pets willing to drink more water rotect Pet Health Helps reduce the risk of urinary tract infection It is very important for the health of pets Excellent protection for the pumpThe fountain pre-filter sponge can protect the water pump more effectively and extend the life of the fountain Recommendation Rinse the filter before use Replace the filter every 1-2 months