Don't scrub your toilet for the next five years! Drop in a Chemfree™ toilet bowl cleaner cartridge, and the deodorizing mineral magnet prevents buildup for 50,000 flushes! No more scrubbing, no blue water. This toilet bowl cleaner kills bacteria on contact, prevents fungus and mildew. 100% chemical-free. Also great in humidifiers and air conditioner pans! Made in the USA.