Wessex Powerflush Pack - Product Details

The History

The Wessex Powerflush Pack was formulated by our in-house chemists, originally to clean problematic industrial
heating systems. When traditional powerflushing did not effectively clean these systems, we were asked to develop a
solution. Having understood the cause of the problem we suggested a combination of Siltfree and Sludge & Flux
Remover. Not only did the systems run more efficiently than before, but the pumps noticeably quietened as the mixture
was circulated. It also proved very effective at breaking through the magnetite crust to get at the soft sludge below.

As the diagram shows, soft sludges settle in the pipes and radiators, then a crust of magnetite sludge forms over the top. This crust has traditionally been very

Magnetite Crust
Soft Sludge

difficult to break down, cracking this problem was vital in creating an effective cleaning method for heating systems.

If you would like to know more about the technical aspects of the Wessex Powerflush Pack, please click here.

To download COSHH (Safety Data Sheet) for the
Wessex Powerflush Pack please click here.

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Pack Contents : There are 2 packs available, one for servicing and one for installation, both are also available in 4x5 litres.

Sludge & Flux Remover x 2 litres, Siltfree x 1 litre, Powerflush Descaler x 1 litre, pH Papers x 1 pack
Full instructions

For use in existing systems where the boiler / heat exchanger is not being changed.

Sludge & Flux Remover x 3 litres, Siltfree x 1 litre, Full instructions

For use when new heating systems are installed and where the boiler or heat exchanger is being replaced. This will remove flux deposits from new systems and sludge / silt from old systems when a new boiler / heat exchanger is being fitted.

Method of Use: (instructions are based on a 10 radiator / 100 litre capacity system).

Connect Powerflushing equipment to system. Leaving all radiators open add 1 litre of Sludge & Flux Remover and circulate around the system for 2 minutes.

The whole system (boiler, pump and all radiators) can be cleaned in one complete loop. This saves a huge amount of time compared with cleaning each radiator separately. Also because none of the individual radiator settings are disturbed using this method, a lot of time is saved as there is no need to readjust radiator valves (only to turn them down if they are too hot after powerflushing).

There are times where it may be necessary to clean one radiator at a time:

When local mains water pressure is not sufficient to supply fresh water quickly enough to replace that being dumped by the powerflush machine.
If there is a 10 °C or more difference between radiators, the problematic rads may need to be flushed separately.

Add at least 150 ml of Siltfree and powerflush around the system for between 30 minutes and 2 hours. The length of time and amount of Siltfree required will depend on the severity of sludge build up (for heavily sludged systems, this can be extended for anything up to 2 weeks with no detrimental effect to the system). Proof that the mixture is fully distributed throughout the system can be shown by turning on the boiler i.e. hot water indicating the presence of the products working.

Use the Powerflush machine to change the system water and dump sludge residues.

For Servicing only
A shorter powerflush operation is now required to clean the primary loop (mainly the heat exchanger) of limescale build- up using the Powerflush Descaler - half a litre per heat exchanger. Turn off the pump and isolate radiators. This typically takes 20-30 minutes but again depends on the level of scale build-up. The descaler is only for use in the primary loop and is not designed for use in the radiators as limescale does not normally form below 72°C.

The book of pH papers provided can be used to test the acid content of the water after flushing. A pH reading of 7 or slightly above is fine. If the reading is below 7 continue dumping water and refilling until the pH is 7. If time is an issue use powerflush / acid neutraliser.

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