Hi all, I am new to this forum but thought I would give it a try and see if I can get some good advice before spending a fortune unnecessarily ... Been noticing that radiators downstairs are not getting very hot like the upstairs rads. Seem to be warmer at the top and cooler at the bottom, but even the top on some is only luke warm. Looked up the problem on the net and seems to be pretty unanimous that its a problem with Sludge build up. Had someone come round today to have a look and he pointed out that we have a Fernox TF1 Heating Magnetic Filter installed.....which I had no idea, so it turns out we obviously haven't cleaned this out since moving in which was July 2018, so over 2 years....and who knows when it was cleaned out before that. So, the plumber suggested that we do that which I am going to attempt this weekend, but he also said that if it is full of sludge it doesn't mean that once cleaned it will all of a sudden have a positive impact on the heating system and would take a long time to improve so suggested I still go ahead with the power flush if I want to be warm this winter. So, just want some advice please on this...….will cleaning the filter out this late on make a difference? and if so, how long do you think before a difference is noticeable? If I have to get the flush done, then that's what I will do but don't want to waste £500 if its not needed. I have no idea about any of this, am not in any trade, am absolutely clueless (didn't even know I had the filter afterall!!) I really haven't got a clue LOL, just thought I would post this on here where all you lot who do actually know what your talking about might be able to help!