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As usual, things are turning a bit last minute. Manifold is now on, loops are on etc. I have started to bleed my 12 circuits and am finding that there is a lot of air being dispelled in the bucket (had to empty about 6 buckets on one loop already). As concrete is being poured tomorrow first thing I'm feeling a bit anxious. Have had to rig up a temporary water supply to the manifold from an outside temporary tap involving a longish hose pipe and there are a few drips along the way to the manifold supply valve (i.e. at the outside tap etc). Is it possible that the air is being introduced into the ufh set up, rather than within the ufh pipework/manifold? No sign of leaks in pipework yet. I won't have a pressure reading until I have water in all circuits so can't yet determine if there is a pressure fall. Certainly no leaks in the ufh pipework (had a visual check in the rooms done so far). I'm hoping the air is being introduced elsewhere - could that be the case? Does it matter that I may have some air in ufh pipework when the concrete gets poured? I presume as long as it is all under pressure then I should be okay? The air can be expelled at some other distant point I presume. Hoping @Nickfromwales or some other experts can advise! TIA!