Most people call extracellular polymeric substances simply EPS. They are described as “…highly hydrated polymers that are made up of polysaccharides, proteins, plus DNA…” EPS are helpful to microbes in that they protect them plus provide an ideal environment against drought plus areas of high salt content. They trap moisture plus nutrients plus because they can have a thick gel-like feel to them, clever people have discovered some uses in industry for EPS. In the world of plant growing, they are quite extravagant in improving plus maintaining soil particle aggregation. Their abilities factor into the structure, health, plus fertility of soil to grow corn and wheat that feed the world. EPS are diverse plus even have some applications having to do with heavy metals, as an antioxidant, plus as a substance that is used for carbon storage. I have no complication letting EPS do their best work for Old MacDonald who likely grows crops along with yodeling E-I-E-I-O at the pigs. I, but, have another name for EPS when they get into my Heating plus Air Conditioning system and start multiplying a community of microbes in my drainpipe or on the walls of the air duct. I call it “a/c mucus” plus I only want to get rid of it. Fortunately, that a/c mucus doesn’t have a opportunity against bleach plus other household cleaners, so a few ounces of any chlorine-based cleaner keeps algae plus a/c mucus under control. I simply can’t get to a lot of the areas in my air duct where EPS or a/c mucus accumulates plus that is why I hire a qualified Heating plus Air Conditioning tech perform a thorough cleaning of my system. I thank EPS for helping the pig farmers, but I’ll surely breathe easier if they stayed where they belong – in the soil plus not in my Heating plus Air Conditioning system.