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ever have a problem with water shooting out of the spa side air control knob. And you just have to screw it closed all the way to keep water from coming out of it. It’s because of everything described above regarding having a good seal
2 1/2 to 3 inch plumbing is exactly right. But as far as air blower because airline is long. Venturi can pull air from a long airline just fine. In most cases air blowers get put on top of the air pipe because the Venturi nozzle body insert do not have a good seal. The one inch pipe Hass to be cut the correct lenghth so that the threads can be threaded inside to where the O-ring seats like it supposed to Only one of them has to lack a good seal to make the entire group of them not work. So all the inserts need to be installed with a good seal. As well as the final and last installation Venturi jet return fittings/nozzles..I was under the impression that all IG spa jets have a venturi of some sort. It would be short of impossible to mix air with pressurized water otherwise.
In most cases, a blower is used when the air line is too long for just a natural venturi so the air intake is insufficient for the jet. Also, the force of the jet is caused by the water pressure and not by the blower or air. A blower simply makes more bubbles.
WARNING: Don't let the PB use less than 2.5" pipe for the spa or you might end up with weak jets. With a 2 HP I would even go with 3" pipe.
ever have a problem with water shooting out of the spa side air control knob. And you just have to screw it closed all the way to keep water from coming out of it. It’s because of everything described above regarding having a good seal
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