There is a big need to make your old toilet more water efficient. Some older toilets can easily use 4 to 5 gallons per flush. Many toilets today only use roughly 1.4 gallons per flush. This makes a huge difference in the amount of water being used, but also for your utility bill.
You can make your toilet a little more water efficient with some easy steps that anyone can do.
Use a 20 oz. Bottle
A very simple remedy is to take a regular 20 oz. plastic bottle and clean it of all labels. Fill with rocks or dirt and put the cover on tightly. Flush the toilet and when the tank is almost empty place the bottle on the bottom of the tank. This will displace a lot of water and will make your toilet shut off sooner.
Bend Float or Add Weight
In a old toilet, most of the water is wasted in the tank. The amount of water you have in there is the amount that is used to flush with. Taking some pliers, you can, with great care, bend the rod that holds the float. This will make the float stay lower in the tank.
You can also add a little bit of weight to keep the float from rising as much as it can. Tie it on and let it sit on the bottom. Experiment with different weights to adjust the level of the float.