30% Extra Free Harpic Flushmatic is a drop-in tank tablet which can be used for any accessible cistern. It works from inside the cistern to release a dose of powerful detergent with every flush. Distributing the liquid across the bowl, it helps you maintain a hygienic and deodorized toilet and prevents the build-up of stains giving you a continuous clean toilet. Harpic Flushmatic Auqamarine provides continuous cleaning, easy to use with no mess, cleans with Blue action, lasts upto 1 month depending on usage.