What is heavier then water, or sand that is low cost?

I am building a machine that needs a heavy column of water, or sand, or ???
I am using the WEIGHT to perform a specific chore.
The heaviest weight is what I do not know: Wet water, so far is the best I can find.
IS THERE ANOTHER OPTION? LEAD IS TOO COSTLY.

Thanks for any answer / help you can provide.
MARVIN SILVERSTEIN msilv9009@yahoo.com
Chardon Ohio 44024

msilv9009@yahoo.com

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