★ Three Stage Filtration: Top quality cotton and premium active fiber remove chlorine, impurities and odors, safe, non-toxic, mouldproof and antibacterial. ★ Authenticated Material: Premium charcoal and exchange resin material, filter captures hair and debris and the charcoal remove odors, keep the water tasting fresh. ★ Easy to Use: Replace filter every 2 to 4 weeks to keep water fresh, encourage your pet to drink more. ★ Great Value for Money: You will get 4 pieces of pet fountain filters by buying this product, which is worthy with such high quality. ★ Tip Note: If there are any quality problem, you can contact us, we will solve your problems within 24 hours.