• Neutralises corrosive flux residues.
• Prevents corrosion and pinholing.
• Dissolves grease and oily contamination.
• Mobilises installation debris.
• No neutralisation reguired.

New and modified heating systems invariably contain installation debris and foulants such as residues of solder fluxes, jointing compounds, copper swarf, oil and grease, and even casting sand from within boiler heat exchangers.

In order to prevent future pin-holing of radiators, and corrosion problems, it is important to thoroughly flush new heating systems with SYSTEM PRE-CLEAN. It is a specifically formulated neutral cleaning product which eliminates and neutralises installation debris, and conditions and prepares metal surfaces of new and modified heating systems.

1 litre of SYSTEM PRE-CLEAN is sufficient to treat a typical central heating system of 100 litres capacity (approx. 10 radiators). For larger systems, treat at a dosage rate of 1% of system volume.

Alternatively, SYSTEM PRE-CLEAN may be injected directly into a radiator, using a suitable device.
The heating system should be operated for at least an hour, with all radiator and zone valves fully open. It is not necessary that the system be hot during the operation, although temperature will generally improve the efficiency of the operation.

Switch off the pump and boiler, allow the system to drain down as rapidly as possible, preferably through a full-bore drain point, and refill the system completely.

Switch pump on, and circulate water for a further 15 minutes. Open the drain valve, and run water to waste at the same time as fresh water enters the system through the f & e tank, with the circulating pump still operating, until the waste water runs clear.

Close the drain valve, and allow the system to refill completely, bleeding radiators where necessary.

SYSTEMSAFE-DM scale and corrosion inhibitor should be added to the system after the operation to prevent scaling and corrosion.