The Knock Out Drain Cleaner (1 Litre / 948ml, CLE 50090276) is a heavy-duty, professional-grade chemical solution engineered to rapidly clear severe blockages in toilets, exterior pipes, and demanding drainage systems. Utilizing an industrial-strength formula, this cleaner targets and aggressively breaks down stubborn organic obstructions, fat accumulations, and heavy mineral scale that standard maintenance products cannot resolve.
 
Designed specifically for trade use and professional plumbing maintenance, the solution acts quickly to restore optimal flow rates within compromised pipe networks. However, due to its high-strength chemical composition, careful adherence to application guidelines is critical. It is typically restricted from delicate fixtures, septic tanks, and certain internal waste connections—such as baths, basins, and kitchen sinks—to prevent chemical damage to pipe joints and seals.
 
Essential for facilities managers and plumbing contractors tackling stubborn drainage emergencies, this cleaner delivers uncompromising power. Proper personal protective equipment (PPE) and adequate ventilation are vital during application to ensure safe handling while restoring full structural and functional performance to blocked drainage systems.
 
Not suitable for waste fittings or pipework on wash basins, baths, showers and kitchen sinks