<b>Notes:</b><br>1.Please rinse filter with water thoroughly before use.<br>2.Replace it every 2-4 weeks to maintain water freshness.<br>3.Replace more frequently with multiple pets using the fountain.<br>4.A small amount of carbon dust may be released for the life of filter which is not harmful to your pet. <br>The pre-filter sponge of the pump will filter out the hair, prevent the pump from clogging, make the pump work longer, and prevent the pet fountain from making noise.