Air in calcium reactor

[iceman86]

Anyone ever have an issue with air getting into the reactor somehow?
I have had this reactor for a while and have battled this issue ever since i bought it. Every night or every second night i have to try and get rid of the bubbles and if i let it accumulate, it slows down my effluent drip rate.

I thought i might have been getting micro bubbles from my sump but i even tried putting the pump into a filter sock to prevent any bubbles going through, and i still get the bubbles.

any idea? its a precision marine 622 reactor fed by a maxijet.