If you're having issues with air in the upper reservoir, our new bleed pipe kit should make things easier. If you already have an RP-402X2 or RP-452X2 (original or revision 1.1), we're sending the kit for free through August! See here for details. Revision 1.2 reservoirs on our website now include this component.

Some pics:





The new acrylic piece links the inlet and outlet together in the upper reservoir, while providing a new copper pipe inlet from the lower tank area. There is a small bleed hole in front of the inlet through the acrylic. I've tried several units now and all have bled in about 5-7 minutes with the pump on max. You should still try to fill the reservoir as full as possible, so tipping the unit so the fill port is high while filling will help. But as the manual for the bleed pipe kit will illustrate, it's fine if there's some air left.

Tim