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CHEMICAL FLUSHING PROCEDURE USING POWERFLUSH FX2
1. Switch on the Clearflow pump.
2. Whilst re-circulating water through the pump and
heating system, slowly add 2½ litres of POWERFLUSH
FX2 to the tank (sufficient for a 10-12 radiator
system), and ensure thorough distribution around the
system.
3. Switch on the boiler, if fitted, and in safe working
order. Allow the system water to reach 60°C, and then
switch boiler off.
NOTE: Even boiler thermostat setting no.1 could
exceed 50°C.
4. Circulate throughout the complete system for 15
minutes, reversing the flow direction regularly, and
monitoring the system for leaks.
5. Close off all radiators (one valve per radiator is
enough), and allow the full flow to go through the hot
water cylinder coil (if present in system).
6. Reverse the flow regularly.
7. Divert the full flow to the radiator circuit, in
preparation to putting the full flow of the pump
through each radiator in turn.
8. Fully open both valves of the nearest radiator on the
ground floor to the flushing pump.
9. Flush this radiator, reversing the flow regularly, until all
cold spots have disappeared, and the temperature
across the radiator is consistent. Close radiator valves.
Note: If your initial system check identified cold or
partially blocked radiators, commence the individual
radiator flushing procedure with the worst radiator
first, progressing to less problematic radiators. This
ensures that the strongest concentration of chemical
is directed at the worst areas of the system.
10. Open the valves on the next radiator, and repeat the
procedure.
Issue: May 2023
11. Work through the rest of the radiators in turn, so that
12. When you have flushed the last radiator, and
13. With only this radiator open, and the pump set to
14. Go back to the previous radiator that you had flushed,
15. Work your way back around the house in the
16. Now with the pump still set to dump direct the flow
17. Return the pump into normal re-circulation mode, re-
18. Slowly add 100 gm of
19. Circulate throughout the system for 10 to 15 minutes.
Section B – Using the Clearflow pump
you have flushed every radiator individually, including
upstairs radiators.
obtained an even temperature across the surface,
switch the pump into dumping mode, as previously.
dump, run until the water leaving the dump hose is
completely clear. Operate the flow reverser and
change the valves to dump in the opposite direction
until clear. When water is clear, close radiator valve.
ensure both valves are open, and repeat the dumping
procedure on this one radiator, alternating the
direction of flow in each direction as you dump. Close
radiator valve.
opposite direction to previously, until you have
carried out the dumping process on every radiator
individually.
through the cylinder coil until it runs clear. Dump in
the other direction until clear.
Note: You have used an acidic cleaner, and therefore
a neutralising chemical should be circulated
throughout the system to ensure that no traces of
POWERFLUSH FX2 remain in the system. Whilst
POWERFLUSH FX2 contains specific inhibitors so that
its presence during a power flush presents no
problems, it is bad practice to leave system water
acidic over a long period of time.
open all radiator valves, and the cylinder coil.
NEUTRALISING CRYSTALS
to the water in the pump
tank whilst circulating
throughout the system.
Continued on next page.
Page B.7
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