Now Streaming
March 16, 2026
Mark Rober's CrunchLabs
Mark Rober's CrunchLabs
Building a Liquid Sand Hot Tub #S03E03
Building a Liquid Sand Hot Tub
Mark Rober's CrunchLabs · Season 3, Episode 3
With the right amount of forced air, a hot tub filled with sand can look like a bubbling pot of soup. But how? Mark breaks down the science behind it.
Episode 3 of Season 3 from Mark Rober's CrunchLabs — available to stream in HD on any device.
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