Used item Free Science One Water ECO For kitchen Cartridge side filter x 2 Used for 2 months Washed, but has a light yellow tint ☺︎ New Free Science One Water ECO Raw water shower filter x 2 ・ 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 dishwashing sponges ・For polishing leather shoes ・Put it in the washing machine's lint filter for washing ・Put it inside knee and waist supports, and pillowcases ・Attach it to the surface of underwear