Have you ever put some mentos in a bottle of Coca-Cola and stood back as the liquid shoots out?
I made these launchpads to hold the bottles in place so they didn't topple over. The launchpad come with tubes to feed the mentos into the bottle quickly.
So get yourself some Coca-Cola (diet works best) and mentos and see how high the liquid goes.
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Launchpad for cola bottles (Bartley Green)
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