Features: brand new and high quality 1. High-quality Replacement Filters: The carbon filters are made of pure cotton and the inside are wrapped with activated carbon, which have the function of cleaning and activation. Pet fountain filter replacement can filter impurified water more evenly to obtain a higher quality water source. 2. Purifying Performance: The pet fountain carbon filter can filter hair, residue, removes, bad tastes and odors from water, keeping water for fresh, to have pets drink clean and for fresh water. 3. 3-Layer Filtration System: The first layer is a high-density filter cotton which can filter large foreign bodies, hair and debris. The second layer has built-in activated carbon which can retain minerals and remove odors. The third layer of filter cotton can keep the water clean and for fresh. The triple-filtered water through the pet water fountain filter is very healthy so that your pet can drink at ease and you can rest assured. 4. Replacement Frequency: Suggest to change the filter 1 to 2 weeks in summer and 2 to 4 weeks in winter, to maintain water freshness. 5. Usage: Please soak the filter in water for 2 minutes and rinse it thoroughly under running water before install, to prevent the carbon dust (which have No harm to your pets) from shedding into water. Package Includes: 1 Piece Activated Carbon Filter or 4 Pieces Activated Carbon Filter Specifications: Material: Cotton, Activated Carbon Color: As Pictures Show Style: 1 Piece/4 Pieces Size: Approx.8x4.5cm/3.15x1.77in Weight: 1 Piece-Approx.18g 4 Pieces-Approx.72g note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!