Stupid durso has decided, for no apparent reason, that it doesn't want to keep a constant water level. I just noticed it yesterday, don't know how long before that it started, doubt it was more than a few days. I haven't changed a thing in that time.
It happily drains away then for no reason that I can see it seems to lose the partial siphon and almost totally stop draining water into the sump. It's not sucking the water too low in the overflow box and sucking air in that I can see. :roll:
I've spent ages adjusting it. Can't get it stable. ONly change I've made in the last few weeks is I drilled a few more holes in the DIY spraybar I have on the return pump. That obviously should have increased the flow a bit, but even slowing the flow back down doesn't seem to make a difference.
Stupid PVC tube, WORK RIGHT D*#$IT!