20 Most Recent American Standard Flowise 2480.216.020 White Dual Flush Right Height Elonga - Page 9 Questions & Answers

probably hair stuck in the drain. did you remove the stopper "pop up" if no hair or blockage there or in the trap, then its further down, you will need a small snake. 1/4 inch cable works well in bath and kitchen drains.
you can purchase one at home depot.

You may have to use a really neat tool and that is aunt splitter. You can get it at O Reilly's auto store or any of those stores. That should remove it.

There is a clog in the line. A plunger usually solves this problem, but you have to use a toilet plunger. Your local hardware store will give you the right tool ($13). If the plunger doesn't work, you need a toilet auger (also called a closet auger), which you can buy for less than $20.

replace float assembly

The brown ring is usually caused by hard water stains. With bit of chemicals scrubbed with a scouring stick. Toilets are fairly cheap if you need a new one for better looks.