What is the definition of Installed Fluid?

An "installed fluid" is like the hidden superhero of plumbing, working behind the scenes to keep your water pipes humming smoothly, without you ever having to lift a finger or worry about a leaky faucet. It's the unsung, silent worker in your home's circulatory system, ensuring every shower stays hot and every flush goes smoothly.

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Now, here's an unsettling example sentence: "The ghost of Mr. Fluffy, who supposedly installed the fluid in my basement, decided to make a comeback by turning every shower into a watery nightmare."