I Seem To Have A Plumbing Problem?

For some strange reason the tank keeps getting low on water. I read when the toilet isn't being flushed a seal (called a "flapper") prevents the water in the tank from leaking into the bowl.

But the tank keeps getting low on water and every 10 to 15 minutes it keeps filling up. So the toilet keeps refilling every 10 to 15-minute intervals.

And any thing I read say it could be flapper not sealed probably or the washer has broken into pieces.

But I’m not sure where the water is going? I have not seen any water on the floor. But the water has to be going some where. And I’m scared it could get worse.

 

You can go dual flush and eliminate the flapper altogether.
https://www.homedepot.com/p/NEXT-by...r-Kit-with-Dual-Flush-Valve-HYR451T/202762847

 

You might have to buy a seal that goes where the flapper goes it's called a flush valve seal.

https://www.google.com/search?q=toi...BAgYEAE&biw=1920&bih=914#imgrc=cReAw8XpHPMpzM