The addition of ethanol, which is fully miscible in water yet, less polar than Water reduces its solubility. This reduction of solubility results in precipitation of least soluble salts first or the salt which is not soluble in solvents less polar than water.
Pole pockets on banners are something that can cause a bit of confusion. This is compounded by the fact that some companies do things differently when producing banners with pole pockets.
1 : a stout pole. 2a : a stout rounded usually wood or metal piece (such as a mast, boom, gaff, or yard) used to support riggingb : any of the main longitudinal members of the wing of an airplane that carry the ribs.