That was the fix-up I ended up with, once we found the discharge field
was choked. AngliaPolution Control retrofitted a shield, aerator and
air lift pump into my existing septic tank, got me an Environment
Agency certificate to discharge into a watercourse, and worked the
discharge pipework into existing drains. Bottom line 2.5K raher than
7K for a new digestor to be fitted.

Out of interest how long ago was this?

Peter Crosland