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Assuming you are diving in a "normal" position, the fact that there is a constant buildup of water suggests the leak is in the mouthpiece where it is picked up in the breathing path and directed into your mouth. Most other possible leak locations would build up in the reg body and be expelled through the exhaust valve when in a "normal" position. Only when you go upside down would it readily flow into your mouth, and then it tends to be quite a bit.