Right, results are in and I'm most impressed... remember I was heading for a 22L batch - not the 23-25L batches I had to make with bog standard BIAB.
So that's 21L into a CraftBrewer cube, plus a litre to play around with for starters or in this case to mix up my tub of Chinese Maltose Syrup.
Again I strained all the wort and trub left in the urn through a kitchen strainer, this time lined with a grain bag, and strained it into a pot then funneled into a bottle:
So I've hit my 22L absolutely spot on, with final loss to trub only the cupful or so that is in the bottom of the bottle. So the bit of recirculation I managed to do seems to have reduced the crap in the kettle.
<ramblings and musings>
I think the problem with recirculating while the bucket is in the urn is that the wort drawn off from the tap is mostly coming from the "path of least resistance" and only part of each jug is coming through the grain bed, so whilst
eventually the grain bed will filter, manual jugging is going to take forever. An unattended pump would handle that, ideally Braumeister style with a heat controller and bursts of heat from the element during mashing itself.
So as a temporary fix to the recirc problem, when I do run #2 I'll absolutely force all the wort through the grain bed by removing it out of the urn altogether into a Handy Bucket then run it back through the grain bed - which should now be nice and compact. Hoisting gradually as I go. And yes I still have a couple of Handy buckets that haven't had the crapper drilled out of them
Anyway on balance, I reckon than even a plain vanilla bucket-in-urn system gives slightly better results than BIAB - acceptable efficiency, better trub management, far less dicking around and quicker cleanup - just tip grain into garden beds and hose off the bucket and FB.
So far, the BIAB with lauter tun gives better efficiency and clearer wort into the kettle although this doesn't seem to have translated into less final trub loss. However with the LT there's a lot more cleaning up, i.e. Bag, Collection Vessel and the LT. And definitely more dicking around on brew day doing the fly sparge.
Who knows I may have some Bags for sale in the near future and a Handy Pail with a hole in it :lol:
Although I could turn it into a Bucket of Death....
Noooooooooooooooooooooo
</end ramblings and musings>