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Thanks for the replys,looks like I'm busy this weekend :roll: Some more info on the vent/feed pipe.I had just the CH on and after @20 mins the rads were hot (apart from the last two)so I felt the pipes in the airing cupboard and the feed pipe was hot but the vent pipe was cold(up to 6 feet...

The f/e tank water looks quite clear but on the sides/bottom there appears to be layer of "goo" which looks like its peeling off in a layer. After the water comes out of the vent pipe the water turns a cloudy dark (black?)colour.

Hallo,I have a few basic questions. CH/HW system is a pumped system ,vented(wallstar boiler) 1 The last two rads stay cold at the bottom so I assume they need flushing/cleaning.Is there a best system cleaner/additive?(sludge removal) 2 CH on its own with pump on low power no problem,pump...