When they aren’t working perfectly, toilets let you know by hissing, squealing, banging, and moaning loudly. Odd toilet noises have a number of causes—from water-flow issues caused by debris and clogs in your plumbing to failing tubes and valves in and around your toilet—which is why it’s important to identify the…
Source: LifeHacker – Why Your Toilet is Squealing (and What to Do About It)