I have a 2007 Hayward Northstar Pump and lately I've been noticing bubbles under the strainer lid.
I run the pump from 7AM to 11AM. And then again from 8PM to 12AM.
The lid is mostly clear when I turn off pump at 11AM (see picture). But by 8PM, before I turn on the pump again, there are lots of bubbles (see picture.) I have been bleeding the valve on the filter to release all these bubbles every night for the past few weeks.
I've replaced the strainer lid t-seal and also tried a new lid. I've pulled out the skimmer weir and restrictor to rule out the skimmer. 4 Cartridge filters have also been cleaned (with operating pressure at 8psi)
Any ideas on where else I could check?