Whilst doing so groundworks the other day, I had to remove a riser from our treatment plant inspection chamber.  I took the opportunity to take a quick sample of the treated effluent to see how clear it was and if there was any detectable odour. I'm pleased to say it was both clear and odour free.   The treatment plant itself (Biopure) appears to be working as it should, the air pump diffusing air into the central digestion chamber, with the outer chamber topped by a layer of scum whic