HIGH COMPATIBILITY: Pack of 6; Dimensions: 2.0 x 2.0 x 0.5 inches (L x W x H); Compatible with 0.5, 1, 2.5, and 4 gallon Replendish Mason pet fountains (automatic gravity water bowls for dogs and cats). The water fountain replacement filter is precisely sized and easy to install. MULTIPLE FILTRATION: The filter is filled with activated carbon and non-woven fabric to effectively isolate pet hair and food debris, reduce impurities and particles, filter heavy metals and odors, and help soften tap water for cleaner, fresher drinking water. PROTECT YOUR PET: Made from high-quality, safe, and odorless materials, this filter helps improve water quality and supports the health of your pet's urinary system. REGULAR REPLACEMENT: For optimal performance and pet health, replace the filter every two weeks. Compatible with Petmate Replendish gravity water fountain bowl filters, Petmate dog water bowl filter replacements, and Mason charcoal replacement filters for automatic pet water dispensers. Quantity: 6 PCS Color: White Material: Carbon fiber Package Contents: 6 x Pet Water Fountain Filters Note: Only the items listed above are included. Light reflection and differences in display screens may cause slight variations in color representation. Measurement error allowed is +/- 1-3 cm.