Rubbermaid Purinel Drain Maintainer/Cleaner, 9.8Oz Refill, Use W/Autoclean Systems, 6/Ct - RCP400586Cleans and sanitizes toilets and drains. Helps maintain drain health. Reduces calcium build up and scaling. For use with Rubbermaid Commercial AutoClean Toilet Systems (sold separately). Refills last for up to 90 days. The Rubbermaid Commercial Purinel Drain Maintainer and Toilet Cleaner for Auto Clean Toilet Systems works to clean toilets and urinals while helping to maintain drain health. This high performance toilet cleaner prevents calcium buildup