I should also point out that the reason your filter was probably that bad is that no one from British Gas has ever bothered to clean it since the day it went in. When I was unfortunate enough to do some contracting for them, I found filters that literally were so full that when I withdrew the magnet the magnetite was exactly the same size as the entire filter, about a kilos worth. I lost count of the amount of times that customers said to me “no ones ever cleaned that before” I looked on the laptop at one job, apparently the filter had been cleaned by every previous engineer for about the last five years, except the shut off valves had been plastered into the wall when the new kitchen was installed about seven years before. if British Gas were the last servicing company on earth left and my boiler broke down, I’d set light to my children for warmth instead.
You won’t need to use both. What you’ve put in will be fine. If anything it might be a little weak as chemicals are normally in bottles with enough for about 100litres which is roughly a ten rad circuit. But you don’t need it super strength so you should be fine.
rather than fill and drain, you’d be better off flushing with the mains, but you will need a mate to help you. 1 connect the drain off hose and run it outside to a drain. 2 open the drain off 3 open the filling loop, make sure you don’t allow the pressure to increase above 2 bar, as you might fill faster than you drain. This is where having a mate to control the fill loop is handy. 4 after a while close all the roads except one. This one rad is now being flushed under mains pressure. 5 give it a couple of mins to flush, then open the next rad and close the one that’s just been flushed. 6 flush each rad in turn. much quicker than repeated draining and filling.
No I’d say leave it at one bottle. Having the mix a bit weaker builds in a bit of a safety margin but it will still do the job. 24 hours is fine. You’ve not got any other issues apart from one iffy rad so I bet your systems not that bad.
If you’ve got just one rad that’s really playing up, id say get the system up to temperature, so it all gets a good clean, but then shut off all of the rads apart from the bad one and give that maybe 20-30mins on it’s own, so it gets maximum circulation through it. Might help shift any really stubborn stuff in it.
Any inhibitor is fine. They are all the same. I just use non branded ones like the ones sold in tool station
You need the boiler running for two reasons, when cleaning. firstly it controls the pump and secondly the chemicals work better when they are hot. You might need to turn up the room stat to keep it running. when flushing you should have the boiler off. You don’t need the pump running as the pressure of the mains will flush through.
My guy has quoted me £577 plus VAT to power flush a system with 8 radiators Seems a bit salty compared to your quote Stirlingmoz
That's £300 for the flush and £499 for the optician to repair his eyes after working with your colour scheme.
