First4Spares Replacement Filter Cartridges for Cat Mate Pet Water Fountains 2PK HEALTHY PETS- Invest in your pets health by providing them with the fresh water they deserve. Changing the filter every month to ensure they are getting the best water you can provide. MULTI-PACK- Our filters come in a handy multi-pack to allow you to have a clear mind knowing you have your pets health taken care of for months to come. No having to remember to reorder every month. QUALITY- Food grade activated charcoal. Quality meet or exceed leading national brands.The duo-density pad on each filter captures hair and debris and the charcoal remove odors and eliminates bad taste.