[Perfect Compatibility] - The replacement cat fountain filters are compatible with 84oz Dockstream wireless cat water fountain models PLWF005, PLWF115, and PLWF105. (Filter size: 3.78 x 2.28 x 0.39 in | Sponge size: 1.37 x 1.18 x 0.35 in). [Premium 12 Pack Filters + 12 Pack Sponges] - Package includes a 12-pack of premium pet fountain replacement filters and a 12-pack of replacement pre-filter sponges. Each set is individually packaged and sealed to maintain high quality. [4-Layer Vertical Filtration] - 1. Ion exchange resin removes heavy metal ions and softens water quality. 2. Activated carbon eliminates odors. 3. Non-woven fabric captures impurities and pet hair. 4. The built-in pump sponge further filters debris to prevent blockages and damage. [Replace the Filter Regularly] - Every drop of water is filtered through multi-layer filtration to remove contaminants and provide oxygen-enriched, better-tasting water. To preserve filtering performance, replace the filters every 2-4 weeks. For multiple pets, clean the fountain and change the filter more frequently. [Optimal Usage] - Soak the filter for 5 minutes and rinse before use to minimize activated carbon dust from entering the water. This dust is not harmful to pets. Color: White + Black Material: Non-woven fabric Package Contents: 12 x Replacement Filters 12 x Sponges Note: Light reflection and different displays may cause slight color variations between the product image and actual item. Measurement error allowance is +/- 1-3 cm.