Yes, all Fernox internal leak sealers, such as Fernox Leak Sealer F4, are safe for use with combination and other low water content boilers.
They will not block valves or vents. Leak Sealer F4 Express is recommended for all pressurised systems as this can be added in 30 seconds via a radiator, filling loop or Fernox TF1 Filter, without the need to drain the system.
One litre of water weighs 1 kg, therefore 2 kg of DS40 System Cleaner per 100 litres of system volume will make a 2% solution.
Citrate action is a term used to describe the powerful chelating effect that the citrate ion has on metal ions. This strong binding effect means that corrosion debris is lifted and transported out of the system during a system clean.
Simply dip the test strip into the system water and it will instantly change colour. By comparing the test strip to the colour chart label on the bottle, installers can assess whether the system water includes the correct concentration of inhibitor. A fully protected system will have inhibitor levels of 100ppm or above – and will pass the test. However,
