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.
This category includes outdoor retractable banner stands, portable banner stands with bases that can be weighted with sand or water, and the popular feather and teardrop flag banner stands, also called flying banners or beach banners.