Cleaning Filter Cartridge Compatible for TYENT Rettin Ionizer MMP Series 5050/7070/9090/11T Citric Acid Cleaning Filter Cartridge for Tyent Rettin Ionizer MMP Series 5050/7070/9090/11T Made in Korea/Made by Korean OEM manufacturer For Descaling the Water Cell Plates; Use the Cleaning Cartridge every 12~18 months to maintain the long-term performance of ionizers. ONE-TIME USE ONLY! NOT Reusable! Compatible Models: MMP 5050/7070/7070T/9090/9090T/11T; NOT Compatible with Under-Counter Models