The water is combined is an air tight chamber with anaerobic digesters (bacteria) which take out about 70% of the bad stuff out of the water.
FORBES: DONQ: LEADING LIQUOR TO SUSTAINABILITY
The chamber is air tight so the biogas let off from the little digesters can be captured and used to power the steam generator that run the stills.
In the second part of the debate, John Swinney told the chamber the budget settlement had been a "major challenge" so far due to a "tight financial settlement" from Westminster.
BBC: Finance Committee Budget debate 1
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