This product removes rust, scale discolorations and other deposits from sinks, wash basins, tile walls & floors, toilets, urinals, shower stalls, bathtubs, stainless steel and many other surfaces. Will not harm septic tanks when used as directed. Cleans and deodorizes your bowl in one easy operation. Clings to sides and under rim – allows sudsing action to go to work. Penetrates and loosens soils, stains and stubborn deposits. Corrosion inhibitor protects pipes and traps.