The set-up has been running fine(and silent) for the past couple of years (odd blip which was easily sortes). Last week the horrific gurgling started. I did the usual reaets (soal and clean pump, reset flow etc) bit this time it is not properly settling down. The gurgling has gone but have now got noisy outlet into sump (not the first time but previously resolved - tried adding a video but failed!)
I have tried all my normal tricks - any one got any ideas?