Hello all, I had a power flush on my system a year ago, 3 years after install, due to massive build up of sludge. What was removed during the power flush was unbelievable. A year on and I checked the F & E tank in the loft and it was absolutely full of sludge and looks like it hasn't been touched in years. Should the tank have been bailed out at the same time as the flush as it looks like all the muck was drained back through the system and I have exactly the same problem now with cool radiators? Surely if the system was flushed on install and then power flushed 3 years later there should hardly be any sludge at all???? They did add inhibitor after the powerflush.