The toilet is possessed....?
Answers: A commode is fairly simple...a river valve to agree to water contained by after a flush, and usually a flapper or other type system to let river out of the tank and into the bowl for the flush. Water surrounded by, water out. Remove the reservoir lid. The Water in spout is on the left side of the cistern, the flush valve is usually within the center. When it is tapping, put your paw on each to see if you can have a feeling vibration from any. Don't worry, that river is clean! My suspicion is the hose in tap is leaking and letting the pressurized marine from your water supply slip by and cause the noise. Repairs are usually simple and straightforward if you're handy beside simple tools.
Call a plumber.
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