The filter contains three packets of activated coconut carbon, which ensures that the water will not spoil over a long period of time. It also contains three packages of resin particles to ensure that the water will not be short of oxygen in the long term use. Features: Contains three packets of activated coconut carbon, which ensures that the water will not spoil over a long period of time. Also contains three packages of resin particles to ensure that the water will not be short of oxygen in the long term use. It’s a perfect accessory for a pet water dispenser. Different kinds of quantities for your choice. Specifications: Item type: Filter Material: ABS+Nylon yarn net Quantity: 1PC, 5PCS, 10PCS(optional) Package weight: 1PC: 28g/0.98OUNCES 5PCS: 140g/4.93ounces 10PCS: 280g/9.87ounces Package size: 1PC:10010010mm/3.933.930.39inches 5PC: 10010050mm/3.933.931.96inches 10PCS: 100100100mm/3.933.933.93inches Package list: 5 * filter