Kaboom Scrub Free Toilet Cleaning System with Oxi Clean is a refillable, continuous clean system that attaches out of sight within your toilet tank. It injects stain fighters into the toilet bowl with every flush and lasts up to 3 months. It includes 1 device and 1 pouch. This powerful bleach-based formula cleans and refreshes your toilet without damaging tank parts or requiring hard scrubbing. Installation takes less than 2 minutes and is simple to do. Over 80% of consumers who've tried Kaboom Scrub Free would recommend it to a friend.