shock
v.— «Ragan then fills the pool with water, shocks it and checks it about a week later to see if the chemicals are OK. “Shocking” a pool refers to using a chemical process called oxidization to break down water-soluble bather waste. Nobody wants to take a dip in a pool of dead skin cells, body oils, sweat and cosmetics, and other unmentionable icky stuff. Some things need to be shocked.» —“Gentlemen, start your pools” Sioux City Journal (Iowa) May 15, 2006. (source: Double-Tongued Dictionary)
Further reading
A listener reports that in and around his hometown of Le Mars, Iowa, the kind of loose-meat sandwich that others might call a sloppy joe is known as a tavern or a tavern sandwich, a name that likely goes back to a restaurant in nearby Sioux City...
Following up on our conversation about the phrase good enough for who it’s for, referring to something that wasn’t done perfectly but was nevertheless good enough, a Clarinda, Iowa, listener shares a similar phrase he used when doing construction...