PERFECT FIT: Our 8+8 pack pet water fountain filter set is perfectly compatible with Viva pet fountain 64oz/ 140oz. Carbon Filters are also fit for PetSafe Outlast Pet Fountain 60oz/ 90oz, 2.55*2.55*0.15inch EFFECTIVE FILTRATION: Our compatible with petsafe foam filters for pet fountains feature denser pores for effective hair and debris collection, protecting your pet fountain pump and ensuring a happier life for your pets HEALTHIER PET: Our cat water fountain filter replacement with perfect size has triple filtration. High-density cotton layer filters out hair and other deposits; activated carbon and ion resin help you filter out most impurities and heavy metals while removing odors, maintaining the clean water all the time EASY TO REPLACE: Easily removable for cleaning and replacement, change compatible with petsafe water fountain filters every 1-2 weeks in summer and 2-4 weeks in winter for optimal performance HAPPIER LIVES: Our pet fountain filters compatible with pet safe water fountain capture hair and debris to keep water clean and fresh. Cat fountain filter also help extend the life of your fountain's pump Brand names and/or trademarks are used here only for product description or identification of devices and/or device types. Errors reserved Pet Supplies