This powerful outside drain, toilet, and urinal unblocker from Barrettine is designed as a safer alternative to sulphuric acid unblockers. It rapidly dissolves organic material, fats, grease, and hair that commonly cause blockages and slow-running drains. The boosted caustic liquid formula ensures easy application at the right strength for wide bore pipes and drains. It is ideal for speeding up slow draining plug holes and for general maintenance to keep drains open. The product comes in a 500ml size.