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Quick update So I did the individual radiator flush yesterday starting at the furthest and then working backwards individually Progress was slow and as advised, I left the central heating on low throughout the flush The radiator closest to the boiler was obviously last and as you can see from...

thanks @DP temperature appears to be holding between 38-42 its a slow process but definitely working it'll definitely take the rest of this evening to complete but at least its "hands off" thanks again !

its currently running at 38 according to the LED display on my greenstar 37cdi so bang on ! thanks @dilalio

@DP - i've taken your advice and have dropped the CH temp on the boiler to 2 ish, and opened the lowest drain and opened the filling loop and managed to get a steady flow/trickle i was nervous about doing this and it took a bit of juggling but seems to be working First radiator looks to be done...

Apologies for forgetting to respond @endecotp Yes when I drain I open the upstairs bleed valves to break the vacuum on the system Here are the instructions from the back of the bottle which do not mention about the colour of the fluid after removal

Is it though unless I’m missing something as i’m filling the system each time, bleeding all rads so the system is completely full and at 1bar, run the system to slosh around and dilute and then drain Not the quickest method but it has to be removing albeit slowly

Thanks for your reply again @DP but what my point is why so many fills, drains (albeit partial) and partial flushes have not yet changed the colour significantly I’ve stuck gallons of fresh water in to dilute the cleaner and run the system but the colour looks consistent still The cleaner is...

@gas112 Here is this morning‘s first drain down (see photo) I have used a clear container so it is easier to see the colour of the water I have taken a bottle as a sample when the container was completely full so I can do some litmus tests when they arrive today using the same volume of water...

I have received confirmation from Wavin that the red text on the pipe denotes that it is barrier protected so a useful piece of information they have provided

Thanks for the reply @DP Answering your last questions first, I wanted to run the cleaner through to give it a good clean as I’ve installed new radiators so wanted to clean the system of any flux, et cetera The mag magnaclean doesn’t do this as I understand it, it is to get rid of the...

@dilalio All copper except 2 x 5m lengths (the flow & return) to a radiator at the end of my extension ( done by my builder 14 years ago) The connections are Hep20 to this radiator

@dilalio nope, no water softener Just 8 classic rads from Stelrad, an Adey professional 2 magnaclean and a Worcester greenstar 37CDI…. That’s it

@gas112 here is the latest drain off water Once it tails off, I shut 3 out of the 4 downstairs drains off and then flush that rad and it will go clean I start with the closest to the boiler and then work away I throttle the drain a little to fill the rads a little before opening again Gotta...

The colour has been pretty consistent @gas112 Always a yellowish colour and no, it’s never been dirty brown or black

Thanks @gas112 So I think this is drain down number six or number seven and as you can see it is still extremely yellow in colour Gotta say I’m actually regretting putting this cleaner in now I think and don’t understand why it’s not coming out if that’s what this yellow is indicating

Thanks for the reply @DP Why do you think I will never be able to flush the system entirely,please? The cleaner is only a 500 mL bottle and I checked out the size of all my radiators which totals 30 litres but obviously that would be plus pipework also So if I said 5 L to fill all the...

Yeh understand that @Mottie which is why I did each of the 4 rads individually Fyi I have 4 upstairs rads and 4 downstairs and all the downstairs have drains I know the water will take the shortest route and thus the upstairs rads won’t get clean water when I flush them individually but I’ve...

Thanks @Mottie and that’s the answer I was expecting although I’m a tad puzzled as to why it’s taking so many attempts to run clean I’ve filled and bled the strain and plan to run the heating for a few hours tonight, and then a quick hour run tomorrow before emptying again

Hi all So I have had MC3 in my central heating for 10 days and today I have emptied the system I have filled the system twice bleeding the radiators also and ran the system each time for 45 minutes before emptying again immediately after turning the central heating off I have also left the...

Thanks @Elsa TLC for advice…understand Yes I’ll do each rad individually and give each one a 1 hour hit Sound good ?