Sani-Flush was an American brand of crystal toilet bowl cleaner formerly produced by Reckitt Benckiser. Its main ingredient was sodium bisulfate; it also contained sodium carbonate as well as sodium lauryl sulfate, talc, sodium chloride, fragrance and dye. When sodium bisulfate is mixed with water, a highly-corrosive acidic solution is produced, which dissolves accumulated minerals such as iron, magnesium and calcium from the bowl. Due to environmental concerns, the product has been discontinued; by 2013 its last original US trademark was cancelled or allowed to expire.