My toilet's tank is draining and I have an idea as to why.
(I should clarify - this is a dual flush!)
I opened it up and dropped a bit of food colouring in – the colouring made it's way to the base of the fill valve.
I drained the tank and got up close to take a picture of the area I suspected to be the cause of the tank draining out.
Towards the left edge you can see that the gasket isn't quite as sealed as it is around the rest of it.
What is the best way to address this? Chewing gum? Some sort of toilet-tank specific caulking? Any advice is appreciated.