Discuss Central heating cleaner in the USA Plumbers Advice area at PlumbersForums.net
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Personally I wouldn't leave in for more than two weeks I don't like the really aggressive cleaners and stick with Adey, Sentinel,or Fernox products. Kop
Whatever it was designed to do would have been done in the first week, so I suppose the effect of the extra week might depend on whether the cleaner was overwhelmed by the quantity of debris (in which case you're just running a very dirty system with free gunk circulating) or whether it had oomph left in which case then it might start attacking system components.
Sentinel advises X400 is a marathon runner whereas the X800 is a 100m sprinter. They do the same thing but take different amounts of time to do it (but the slow approach is supposedly better, if you have the time).
Interestingly, I once went the whole hog with a relatively small system and (following Sentinel's best practice advice) circulated X400 for a month before the flush itself. In theory the X400 should have already shifted quite a lot of debris. In practice, the X400 (which I drained out) did not actually appear to have removed an awful lot, and when I powerflushed with Fernox DS40, there was still an awful lot of magnetite and scale in the system. Perhaps the X400 had helped soften it all up with the consequence that the flush itself was more successful, or perhaps it was a total waste of time; without comparing with an identical un-pre-treated system, it's hard to know.
Sentinel advises X400 is a marathon runner whereas the X800 is a 100m sprinter. They do the same thing but take different amounts of time to do it (but the slow approach is supposedly better, if you have the time).
Interestingly, I once went the whole hog with a relatively small system and (following Sentinel's best practice advice) circulated X400 for a month before the flush itself. In theory the X400 should have already shifted quite a lot of debris. In practice, the X400 (which I drained out) did not actually appear to have removed an awful lot, and when I powerflushed with Fernox DS40, there was still an awful lot of magnetite and scale in the system. Perhaps the X400 had helped soften it all up with the consequence that the flush itself was more successful, or perhaps it was a total waste of time; without comparing with an identical un-pre-treated system, it's hard to know.
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X800 is fine upto two weeks I think I remember it’s either one or two
2 weeks for x800 I think, honestly not that convinced on those cleaners, the info says its like 6.8ph iirc and that's not exactly strong. Maybe there's something else in it but I don't know. if you can leave it in for 2 weeks then I'm gonna assume whatever would start happening that's bad would probably have started happening by that point.
Well, it's interesting what Fernox told me. They were advertising F8 and I questioned how a PH neutral formula could work as a descaler. I received a detailed reply which included the following information:
[...] the neutral pH cleaner will not react directly with hardened limescale deposits. Loose non-adherent limescale deposits/particulates would be assisted in removal during the flushing process. If limescale dissolution is the primary purpose of a clean then an acidic cleaner such as Fernox DS40 should be used.
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Yes
Hot flush and cold flush is advised I believe.
I like a good mains flush, filling loop onto the flow and drain point or filter drain on the return and blast some cold water around the system
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Yep not totally but 0.5 bar at least . Kop
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Yep if you have a dosing pump or a adapted plant spray to get it in under pressure , if not isolate a rad at the valves drop the water out a wet vac is best then you can dose via the 1/2" plug Screwfix do a dosing adapter cheap as chips . Kop
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