24 Pcs Replacement Filters for Dockstream Cat Water Fountain PLWF105/PLWF115/PLWF005, 12 Pack Pet Water Fountain Filters with 12 Pack Pre-Filter SpongesCompatibilityThe replacement filters are ONLY compatible with PETLIBRO dockstream cat water fountain PLWF105 PLWF115 PLWF005. (Filter size: 3. 78 x 2. 28 x 0. 39in) 4 Layer Filtration SystemEach cat water fountain filter consists of activated carbon, ion exchange resin and non woven fabric. Activated carbon and ionic resin are individually packaged, which not only serves as a re filtering function, but also ensures clean water. The combination of