Replacement Filter for 2L Water Fountain. 1 pack contains 6 replacement filters. The filter can help remove chlorine in water, impurities and odors, block hair and dirt, make the fountain water fresher and tastier. To ensure fresh and clean water, we recommend changing the filter every 2 to 4 weeks. Rinse the filter thoroughly with water before use. Filter size: 9 x 6 cm. Package includes: 1 set of filters (6 pieces/set). Product description This is for pet water fountain only. 6 pieces per set, 1 set per package. Filter dimensions: 9 x 6 cm.