I agree with Wiff that it’s ...

I agree with Wiff that it’s best   not to overreact and not try to fix something that does not need fixing. However if you have anaerobic digesters, if   even a little   Nocardia foaming is visible on aeration tanks, you can have serious digester foaming problems…so if you have anaerobic digesters you probably should be more careful. Also these in days of  energy recovery, the  extra sludge produced  at  lower  SRTs can  mean less energy  consumption in the  activated sludge  system an more “fuel” for  energy production from  anaerobic  digesters.