The toilet upstairs flushes good. The toilet in the half-bath downstairs will sometimes flush completely and other times the water will swirl around with some of the items being flushed.

The first is to remove the tank cover, flush the toilet, spray a little silicone lubricant into the top of the intake shaft where the valve is located, and work the float mechanism up and down the ...

Before you buy that shiny new toilet, there are a few things to consider, such as the type of bowl, flush, existing plumbing, ...

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The flush valve gasket hadn't been properly positioned and tightened. I repositioned it, tightened, watched for leaks, repeated the process twice more, then filled the tank with water yet again.