How many orbeez are there?
According to the Orbeez website, 100 dried water beads yield one cup (240 milliliters) of fully hydrated Orbeez. There are 16 cups in a gallon, and therefore 1,600 water beads in a gallon. So, for a 42-gallon (159-liter) tub you'll need 67,200 water beads to fill a standard sized bathtub.
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