Maybe one of these similar products would be of interest:-

16Pcs Cat Water Fountain Filters, Cat Fountain Filters Set, 8Pcs Activated Carbon Filter and 8Pcs Foam Filter, Cat Mate Filters, Pet Water Fountain Filters Replacement for Petlibro Water Fountain

Pack of 12 Cat Fountain Filters for Catit Pixi Drinking Fountain Pump Filter, Cat Water Fountain Filters, Drinking Fountain Filter for Cat Fountain Replacement Filter Cat Fountain

Pack of 8 Cat Drinking Fountain Sponge Foam Filter, Sponge Filter for Cat Fountain Filter, Replacement Pet Fountain Water Fountain Foam Filter for Pet Dog Cat Fountain

Cat Water Fountain for Drinking, 1L Wireless Pet Water Fountain with Motion Sensor, Battery Operated Cordless Water Fountain Cat Bowl with 3 Working Modes, Quiet Pet Water Fountain for Small Dog

PawPoll Cat Water Fountain for Drinking, 2.2L Cat Water Fountain, Ultra Silent Fountain with Activated Carbon Filter, Automatic Dog Drinking Fountain, Green