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How to Weigh Down Balloons in Swimming Pools

By Derek M. Kwait ; Updated April 18, 2017
If you make balloons heavy enough, you can float over them instead of through them.

Pool inflatables float because the air inside makes them less dense than water. Similarly, rocks and other weightier substances sink since they are more dense than water. Most people think of a balloon as something that floats or flies, but it's really just an empty rubber bag. When you breathe into it, it flies away, but if you put something denser into it, like rocks or sand, it will actually sink. If you put sand and air into a balloon, you will get a balloon that looks inflated but is actually heavy enough to sink in water.

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Place the narrow end of the funnel into the mouth of the empty balloon.

Pour sand into the balloon until it is approximately one-quarter of the way filled with sand.

Use the balloon pump to blow up the balloon to your desired size.

Tie the mouth of the balloon closed quickly as you can to prevent air from escaping.

Put the balloon in the pool.

Things You Will Need

  • Funnel
  • Sand
  • Balloon pump


If sand is not available, you can fill the balloons with pebbles, coins or any small thing that sinks.


Blow up the sand-balloons with a pump and not your mouth to avoid getting sand in your mouth.

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About the Author

Derek M. Kwait has a Bachelor of Arts in English writing from the University of Pittsburgh and has been writing for most of his life in various capacities. He has worked as a staff writer and videographer for the "Jewish Chronicle of Pittsburgh" and also has training writing fiction, nonfiction, stage-plays and screenplays.

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