Fernox Central Heating Cleaner F3 500ml
Easy enough for the home DIY'er to apply to header tank after draining the system, let it work, refill and redrain. Unfortunately it was too late for me to avoid a new pump install but have Fernox f1 inhibiter to put in the tank to help prevent future clog ups.
22 Jul 2015
I've had an extremely noisy heating system for the last year, put one bottle in and no result. drained down and put three bottles in, no result for three days and I finally slept through heating coming on in the morning. Brilliant product would recommend it to anyone.
21 Dec 2014
I was surprised how clear the water was when I drained the system for the first time in years to change a valve. However, after running the system overnight with the cleaner I was pleased to see some discolouration when I drained the system for the 2nd time.
10 Nov 2014
I wouldn't use anything else
Last year I flushed my system using F3. I then refilled it and used F1. Just recently I needed to change a large radiator for a smaller one in the kitchen. Due to kitchen refurbishment nothing to do with problems with the heating system. On draining the system I was amazed to find that the water coming out of the drain tap was all but clear. So guess what I put back in? I wouldn't use anything else.
20 Sep 2014