Homeowner Benefits

  • A simple way to seal small inaccessible leaks and weeping joints
  • Helps avoid costly maintenance repairs

My installer tells me he always uses MagnaClean®. The amount of sludge collected was impressive. MagnaClean® is not only neat, it performs a fantastic job.

Mr D Cage, Highworth

Dosage Instructions

How to use

A 500 ml bottle will provide effective treatment for a typical 100litre/ten radiator system. For larger systems, use further MC4 as required. To introduce MC4 to the system, we recommend using the MagnaClean® canister to dose the system. No preparation is required, and you can use your heating as normal after dosing.

Alternatively, dose via a radiator or the F&E tank. For long-term system protection, use MC4 Leak Sealer in conjunction with ADEY’s MC1 Protector. Do not use in single feed indirect cylinders.

Also available in 300ml.

Technical Specifications

Physical and chemical properties

  • Appearance: Viscous liquid
  • Colour: White/off-white
  • Odour: Slight
  • Solubility: Dispersible in water
  • pH (concentrated solution): 7.0
  • Relative Density: 1.06 g/cm³


  • Non-hazardous
  • Non-toxic
  • Biodegradable


  • EN 9001 & ISO 14001

Installer Benefits

  • High performance leak sealer
  • Reduces pressure loss on sealed systems
  • No blocked pumps, valves or air vents
  • Suitable for all heating systems
  • Can be dosed through the MagnaClean® filter
  • Available in 500ml
  • Subject to availability in certain countries

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