Fortunately, a toilet has few moving parts. And usually, only one of them will make noise as the toilet tank becomes full. That’s the ball cock, or water inlet valve.

Next, remove the tank lid. Inside you’ll should see the main parts responsible for your toilet's water control: the flapper chain, flapper, overflow tube, a ball float or float cup, and fill valve.

There are three likely culprits that can cause a toilet to run continuously — the float, flapper, or fill valve. Luckily, each is easy to replace.

GRAND RAPIDS -- SelectAFlush, a retrofit double-valve for toilet tanks, is the region's first product spawned by innovation consultants at economic development agency The Right Place. David and ...