It is suggested to replace it every 2-4 weeks, depending on usage. ?Healthy Water? : NPET adopt high-density and high-content activated carbon filter, and the filter structure is matched with white high-density filter cotton to achieve multiple filtration, which can effectively maintain water quality, increase oxygen content, and protect the health of pets. ?Easy to Use?: Rinse the filter with water thoroughly before use, replace it every 2 to 4 weeks to maintain water freshness. ?4 Packs in One Set?: You will get 4 pieces of pet fountain filters by one order, which is worthy with such high quality. ?Compatible?: This filter replacement is compatible with NPET WF050 & WF100 cat water fountain fountains.

Best Sellers Rank: See Top 100 in Pet Supplies. Product Dimensions: 4.5"D x 2.25"W x 0.87"H. Brand: NPET. Duration: 4 weeks. Material: Activated Carbon,Cotton. Country of Origin: China. : B087R2TVGQ. Manufacturer: NPET. Date First Available: April 28, 2020. Item model number: WF050. Package Dimensions: 4.96 x 2.76 x 1.46 inches; 1.76 Ounces.