If you have a running toilet that is constantly flushing you will need to either replace the toilet flapper or the flush valve. Fixing a constant running toilet is easy. I will show you how to check to see if your toilet is running and replace the flush valve. This is a repair that is simple and easy. Doing it yourself instead of calling the plumber will save you money.
helpful links:
Flapper: amzn.to/43xeE5K
Toilet flush valve: amzn.to/44RNfwf
Rust remover: amzn.to/3NV86Ie