Hello, if it is exactly what I am doing, it is straight from the street. Pedro, why does it happen when I pull it from a bucket of water? It will be for lack of pressure also bone I grab the hose and put it here that the sucker pump of an equal bucket has bubbles ..
In that case a law of the physics of liquids intervenes, because, when you put the hose in a container with low height of water level, as the flow that sucks the hose is high, it forms a vortex, (swirl), from from the mouth of the hose, when the whirlpool rises enough, it takes air from the surface and enters the liquid stream, that only happens. luck