The brick, or anything else that displaces water in the tank, will save on your water bill... The slight trickle that you are hearing is probably a worn out flapper that is allowing water to bypass it even when it is closed... They are easy to replace.

fredg2013: 2 months ago

Good answer; I forgot about the flapper might be worn out!

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RogerAnglin: 2 months ago

Ya, they tend to curl around the edges.....

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If it has the arm with the ball float on it grab the arm with both hands and bend it down some this will make the water shut off at a lower level

You hear a trickle of water? That means water is flowing into the overflow pipe, going down the drain!
Take off the cover on the tank. Look to see if the water is really overflowing into the pipe, in the middle of the tank. If it is, get a screwdriver, or a butter knife, and turn the screw on the float valve, so the float will stop further down toward the bottom.
There are many kinds of floats, and the adjustment screw will be in a different place on most of them. A brick in your tank won't help save water if it's running over the drain pipe!
Good luck. You can use Google and find pictures of inside the tank and might find a pic of the type you have,.

A brick only displaces the water that would otherwise be in the tank but doesn't change the water level.
Most toilet tank mechanisms can be adjusted to stop filling at a lower level.
But there are many different designs and I don't know yours. There is often a small screw where the float pivots.

Putting in a brick or lowering the filling level does save water, but does not solve a leakage problem. To stop the trickling you have to make sure that the seals are working, the one at the bottom of the piece of pipe that gets lifted up when you flush, as well as that in the valve that stops the filling up when the box is full. Sometimes it enough to clean them, sometimes they need to be replaced.

The trickling sound your hear is almost definitely the flapper not sealing completely. Simple to replace and cost less than $5 to replace. There are instructions on the package as well as videos on YouTube or Ehow. Here is one:

https://www.youtube.com/watch?v=MZ_r_xexCAQ

A brick does displace water without requiring an adjustment to the float arm. However, I have been told that a brick may eventually slough off grit that may adversely affect the seal. A work-around is to put the brick in a resealable plastic storage bag. Regardless of the cause of a bad seal, which is almost certainly the cause of the trickle (although it could be the overflow as redg2013 stated), lift up the flapper at the bottom of the tank and run your finger around the gasket to wipe off any obstruction. If that doesn't help, your local hardware store will explain what needs to be done. Bring a picture of the inside of your tank to help identify the type of parts you need.

As a side note, some people are squeamish about putting their hand in the toilet tank. If you are one of those, remember the tank water is not contaminated like the water in the toilet bowl. It is even safe to drink in an emergency when other more potable water is not available.