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.
Also, since the boom operator is standing around all day, holding the microphone in the air, it is important that the fish pole be lighter to help avoid injuries. Boom operators are required to constantly update their technical sound knowledge and be aware of new trends in the industry.