The term 'floating filth' can be described by the four-letter word 'SCUM'. SCUM is a thin layer of impurities that forms on the surface of a liquid, such as water. It is usually composed of organic matter, such as algae, bacteria, and other microorganisms. Floating filth is a term used to describe any type of debris or waste that is floating in a body of water. This could include plastic bottles, food wrappers, and other types of trash. Floating filth is a major environmental issue, as it can pollute the water and harm wildlife.