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IS it true that installing a Spirovent Jr. doesn't automatically insure 100% air elimination in the system? That is, I heard that the Spirovent will take care of microbubbles fine and will scrub out small bubbles as they come out of the water when heated, but it's not too good taking out the large bubbles trapped in the system.
My case: I have a system with no air elimination ( no scoop or any air venting at all). I try to bleed the air out of the system by closing a ball valve on the return to the pump and opening the hose valve (see pic). After sometimes 20 minutes of running cold water thru the system, I still hear large bubbling and loud gurgling sounds in the pipes. It seems that alot of air gets caught in the 3/4" pipe above the boiler that makes 2 or 3 right angle turns and doesn't run straight. The air is caught in the elbows. I thought of sweating out one of the regular elbows and installing a right-angle elbow with an air vent at the trouble spot, but this seems unorthodox. So now I'm thinking that a verticle-mounted Spirovent Jr. will take care of the air problem. I 'm an amateur so any suugestions to reverse water flow to move the air I cannot do. Is there a simple fix?