Harpic ITB is an innovative toilet block that helps clean and freshen with every flush. The ITB works to maintain a constantly fresh and hygienic toilet. So your toilet feels fresher for longer, even in between cleans. Harpic ITB targets the toilet bowl for stains and deposits, and keeps it visibly clean and fresh for longer. It fits discreetly under the rim. A single block of Harpic Hygienic toilet cleaner lasts upto 3 weeks depending upon your usage. It can help prevent stain build-up, keeping your toilet clean for longer.