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.
pole - a long (usually round) rod of wood or metal or plastic. 1  barge pole - a long pole used to propel or guide a barge; I wouldn't touch it with a barge pole. 2  microphone boom, boom - a pole carrying an overhead microphone projected over a film or tv set.