Idea to conserve water discharged from Flush Tanks

This year there has been a threat of water scarcity looming over the city of Mumbai. Municipal Corporation of Greater Mumbai (MCGM) is seriously looking at ways and means of conserving water. Given below is my idea which could save tons of water, if implemented.

Recent flush tanks are coming with 2 knobs - one for half discharge and other for full discharge. But, even half discharge knob releases substantial volume of water. I learn from few minutes of Internet search that at least 10 to 15 liter of water is discharged with each press of the knob.

Yesterday I got a simple but good idea to reduce volume of discharge from Flush Tanks. Implementation is easy and would easily conserve about 2 liters of water per discharge.

You will require:
1. A plastic bag which can hold say 1 or 2 liter of water. Ordinary Milk bag or small size plastic carry bag would do.

2. String (Plastic, preferably) 6 to 8 inch long

Step-1:
Take a plastic bag. Fill it with water. Tie it up with the string at the top. Ensure that water does not leak after tying it up.

Step-2:
Open the lid of the flush tank. In most cases, it should be easy. Now, insert the filled plastic bag inside the flush tank, in the empty space. Close the lid.

If tank size permits, you may insert more than one filled plastic bags.

Note: In flush tanks with two knobs, you may have to lift the knob, locate a plastic screw. Open it up using a screw-driver. Pull out the knob, plastic screw assembly. Lift the lid.

It's done. Now, every time you flush, discharge would be reduced to the extent of size of the filled plastic bag.

I've already implemented the idea in all the flush tanks of my house. Here is a video.
How to reduce volume of flush water discharge video


Let me know, if you like the idea. Also, let me know if you have suggestions for improvement.