Cat Fountian Filter kit: Set of 12 pack of premium pet fountain replacement filters and 5 pcs of replacement pre-filter sponges.
ONLY Compatible: For Wopet Automatic Cat Water Fountain, W300 & W300B &W500&W500B model.
Usage Method: Please rinse the carbon filter in water for 5 minutes thoroughly before use, then install the cat fountain filter into the cat drinking fountain.
Friendly Tips:We recommended to replace the filters every 2 weeks to keep water running fresh and pure. Change the filter every 2 week will be healthier!