Compatibility:This cat water fountain filter is compatible for petlibro with 2.5L/84oz pet fountain PLWF005 / PLWF105 / PLWF115. Please make sure your water dispenser model before purchase. High Efficiency Multiple Filtration:The pet fountain filter for Petlibro consists of cotton layer, activated carbon and ion exchange resin. It effectively filters hair, debris, heavy metals and other impurities and softens hard water, improves the quality and taste of water, and also removes odors. Provide fresh and clean water for pets to keep them healthy and hydrated. Easy Installation & Replacement: Filter replacement is as easy as removing the old filter and inserting the one into the designated compartment. Save you a lot of cleaning time. Recommendation: To prevent carbon dust from falling into the water, soak the filter in water for 5 minutes before use, then rinse the filter under running water for 30 seconds to remove excess carbon dust for best results. It is recommended to change the filter every 1-2 weeks. Color: Gray & Black Material: plastic Package Contents: 40set x Pet water dispenser filter element Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.