It's the easiest hygienic way to keep your toilet clean and fresh with every flush. Harpic Hygienic is the first cage less rim block. It lasts up to 1000 flushes and It's completely safe for septic tank. Gives you  a Continuous jasmine fragrance even between flushes. Click hook into cage, clip securely onto rim of toilet, where waterflow is maximum. Keep the colored gel should be facing outwards.