I have a push button cistern and have noticed that there is now a hissing sound whenever the toilet is flushed - this did not occur before. The other thing is the cistern is not filling up as quick as it used to.
I opened the cistern to see what was making the hissing sound. It is coming from the valve on the left that lets the water in. Instead of a normal flow of water, there is a strong jet of water coming out.
Has anyone got any ideas how I can fix this please.
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