Harpic Powerful Drain Opener Cleaning Gel is designed to unclog drains quickly and efficiently. It works in just 5 minutes, killing 99.9% of germs, making it ideal for use in bathrooms and kitchens. Key Features Unclogs drains in minutes Kills 99.9% germs Effective for bathroom, shower, baths, basin, kitchen Powerful drain opener Sodium Hydroxide (Caustic Soda), Sodium Hypochlorite (Bleach), Non-ionic Surfactants, Water.Harpic is a global brand. This is a heavy-duty, corrosive cleaning gel designed to unblock clogged drains.Pour slowly the entire bottle (500ml) into the affected drain. Leave for 15-30 minutes. Flush thoroughly with hot water.DANGER: Highly corrosive. Causes severe skin burns and eye damage. Keep out of reach of children. Use protective gloves/eyewear.