i didn't seal up the spray nozzle that's y there are leaks even though u closed the air intake...i'm afraid that the nozzle dun work well...since it is ok, i think we can seal up the thing...but wait for me to do it...okok?? still have another nozzle for u to test out...
the traping of the bubbles is due to the baffle plate design...will try to solve that...but need to dismantle the whole skimmer...
as for the o-ring, i've got no idea y issit leaking...no such problem for my other units, my FR, becketts, no prob at all...maybe the contractor cut the groove too deep...will get u a thicker o-ring...
lets see if rio3100 will have better effect, it is the recommended pump for AquaC EV-180...lets see if it works better...