Turn off the water supply to the toilet and wait a few hours to see if
the level in the tank goes down. If you want, you can mark the water
level with a pencil when you turn the water off, so you can see even
if it drops only a small amount.
So what. If the valve doesn't shut off completely, you can HEAR it by
putting a stick against the top of the valve and the other end to your
A slow leak in the flapper, however, is harder to detect, and the test
I outlined will find it.
I think that even if you were stone deaf you could put the stick
against your skull and feel the vibrations.
The stick, used in this way, is a primitive version of the
stethoscope. Mechanics sometimes use a large screwdriver in the same
way to hear things such as valve tappets tapping. ;-)
The first time I saw that trick was my father putting the screwdriver
onto the power steering pump, the water pump, an the alternator. The
sound was loud, but without the poor mans stethoscope we couldn't tell
where it was coming from. It was the alternator bearings.
On 1/18/2010 18:56, firstname.lastname@example.org wrote:
Often you can't hear such a minuscule leak and it can be hard to detect.
A few years ago we got a whopper of a water bill and I found the water
level in the upstairs toilet was just slightly above the overflow tube.
It didn't make any detectable noise. It had the version of fluidmaster
where you just twist off the top a quarter turn to replace the valve. I
did that and when I turned the water on I noticed a very tiny stream of
water was squirting out the side of the fluidmaster riser tube because
of a defect.
Your test would have never found the problem.
Walk around the house and make sure something else isn't broke and
Look - Listen - Feel.
Look - in the bowl. A tiny leak from the flapper will cause the water
to shimmer/ripple a bit as it drains from the rim holes.
Listen - a heavier leak at the flapper will cause a chatter/shudder
sound and the vale would open for filling the tank. so you hear that.
Happens in the middle of the night.
Feel - the slim on the flapper, wash it and the flapper seat with mix
of bleach to kill the scum.
Go back to bed, if it was the middle of the night.
The dye test mentioned: Allow this overnight.
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