These made for Cat'it Design Senses Fountains and Flower Fountains provide clean, fresh water to your pet. The Cotton Surface on each filter block hair and debris, the charcoal remove odors and eliminates bad taste while the ion exchange resin softens hard water by eliminating magnesium and calcium. This hybrid filters help soften the minerals like magnesium and calcium in the tap water to help prevent urinary tract diseases. *** NRP new designed replacement filter disc really contained alot materials than original OEM filters; And also other generic filters for catit !!! *** Our new design filter Removed the plastic plate. Made with 100% cotton. The important feature is filtering speed is very good! It won't cause to the water overflow anymore, after we tested. ( our filter doesn't caused flooding on the top ) Product Feature: - NRP FILTER spend times & thought on this special hybrid water filter. Please return it for refund if you feel don't satisfied the filter quality. We're 100% guarantee for your purchase experience. - Warm tip: this water filter only designed compatible for Cat it Pet Fountains. It won't fits in other named brand water fountains use the similar water filter disk. - This is not a Ca‘tit OEM product. The brand names and logos are the registered trademarks of their respective owners. Any use of the Cat'it brand name or model designations for this product are made solely for purposes of demonstrating compatibility.