How much do you charge in putting fernox to the central heating?

Hi, was the fernox put in to fix a leak? Gary

Hi - Not sure what type of system you have, but this sounds as though you have a type of sealed system boiler, with which you were getting periodic boiler breakdowns due to pressure drops? Looks as though (quite correctly sometimes) your plumber thought that this was due to a tiny leak somewhere in the system, and added a leak sealer (Fernox produce one called F4). I personally would have checked the expansion vessel first, as this can produce similar problems, which would result in further breakdowns within a timeframe similar to the one you mention. Individual charges sound fair, but sounds as though a more thorough investigation the on the first visit was called for, which might have prevented the second visit. Perhaps you could elaborate further by letting us know what type of system you have (i.e. does it have tanks in the loft or not?) and is the problem okay now? Is there any sign of water leaking on the outside wall behind the boiler? Hope this has been of some help Rick :)