The outer cotton layer of the filter catches hairs and the sponge filter with activated carbon cleans the drinking water. The Dual filters offer a perfect supplement to the UVC Germicidal lamp. Thanks to the dual active filters, the Agua's drinking water remains fresh, clean and tasty. ✔ Supplementary filters to the UVC Germicidal lamp ensures clean water. ✔ Dual active system improves the taste of drinking water. ✔ Easy to place in the filter holder of the Agua. ✔ Each package contains 5 Agua filters.