MaltyHops
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How have you set up the MLT drain? Manifold, false bottom, braid, ...?... or the manifold is not done right you will get channelling. slow the recirc and
look for signs of channelling when you drained the tun.
...
If manifold, probbly best to look at Tun Geometry and Flow Potential
from Palmer's book if you haven't already.