Precipitates. Depends on where they're coming from. If after the cell, that's from the electrolyte. After the bubbler, probably calcium. Either way, that is not nice, and should not enter the engine.
is in the hose that goes from the bubbler to the air intake, so how can i prevent this? is there´s something that can be done? may be some other guys have this trouble too! or what do you recomend?