Re: Kohler Rialto One Piece Toilet Leaks

see below copied from http://www.fluidmaster.com/usa.html

Toilet leaks occur in two ways and are often very difficult to detect.
The most common toilet leak and often hardest to detect is caused by a
deteriorated or defected flush valve (flapper) ball at the bottom of
the toilet tank. If the flapper or ball valve does not seat properly
and form water tight, seal water will leak around it into the toilet
bowl. Often, this leak will occur without being heard. To test for this
type of leak, add a few drops of food color or place a colored dye
tablet (available from many hardware stores or possibly your water
utility) in the toilet after it has stopped filling. Do not flush the
toilet. Wait about twenty minutes: if the food coloring or dye appears
in the toilet bowl, the flapper/tank ball or drain seat is leaking and
needs to be replaced.

The second most-common type of leak is caused by an improperly adjusted
or broken fill (ball ***) valve. If the float is set too high or if
the shut-off valve fails to close completely, water will continue to
enter the tank and flow into the overflow tube. This type of leak can
be seen simply by taking the tank top off and observing if water is
flowing into the overflow tube once the tank is full.

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