Used item Free Science One Water ECO For Kitchen Cartridge side filter x 3 Used for 2 months New Free Science One Water ECO Raw water shower filter x 1 - The following is quoted from the Free Science publication, ECO Newsletter: The side filters for the One Water ECO kitchen cartridge can be reused. The filters have been washed once. - As a substitute for a dishwashing sponge - For polishing leather shoes - Put it in the laundry net of the washing machine and wash it - Put it inside knee and waist supports, pillowcases - Stick it on the surface of underwear