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Features :
Place in the toilet tank to remove and prevent pink/ reddish brown stains in the toilet bowl
Removes stains at or above the toilet bowl water line
Serratia Marcescens is the bacteria which creates unsightly stains
The copper and zinc ingredient creates a hostile environment for Serratia Marcescens
Change every 24 months. Made in the USA. Does not remove iron stains found below the water line