Compatibility: Dog water filter replacement are only suitable for 3L With Filter/3.6L/4.6L/6L/8L automatic pet waterer; We provide 12-Month Replacement and 24-hour support, please contact us at any time. Triple Filtration System: Dog water dispenser filter has 3 layer filtration system. High-density filter cotton can filter hairs and sediment; Activated carbon can remove chlorine and odor, and preserves minerals; Ion exchange resin can filter heavy metals. Ensure Health: This filter can stop hairs and impurities, keep water clean; Filter out heavy metals, and remove chlorine and odor, soften hard water and improve water taste for your pets. Drink healthy water, reduce urinary tract infections risk. Warm Tip: Our filters are packaged in a thickened paper box, before changing the filter, please soak and rinse filter with running water. Replacement Frequency: In order to achieve filter effect, please replace filter every 30-45 days, please change it more often if your have multiple. Material: carbon fiber colour: White Package Contents: 4 x Replacement Filters / 8 x Replacement Filters 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.