SWIM really liked this part of the work.
3.5 liter was reduced to +/- 1 liter.
This was placed in the fridge.
Next day swim decanted the liquid and on the bottum there was a thick almost black layer of tar like substance.
So out of the 400 grams of MHRB in one liter SWIM pulled 55 grams of nasty unwanteds
PH is 3.91.