Flushing new system

[oldbutnotdead]

Whats best to use to get rid of any flux etc in the pipework? System volume is about 400 litres (thermal store) so I'm reluctant to chuck 4 litres of Sentinel X300 (£17/ ltr) through if 4 litres of Toolstation own-brand (£7/litre) will do the job.
TIA

 

[muggles]

Could just pay less money for X300... https://www.ebay.co.uk/itm/332418003262

 

[oldbutnotdead]

Ta, almost given up on Ebay last couple of years but thats a result. It is still 100:1 for that stuff isn't it? (Blurb just says 1 litre will do one standard system 10 rads)

 

[muggles]

Yeah they usually say 1 bottle will treat about 100 litres of system water

 

[oldbutnotdead]

Cheers. Found some even cheaper (£5.39), should be here Sat, give me time to finish wiring up the control gear