The volume of each sphere works out about 0.0003 cubic yards and 6/0.0003 = 20,000 spheres
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For a 4-inch thick slab, you will need at least 9.48 Cubic Yards.
2,000 cubic feet = 74.07 cubic yards.
5.3 cubic feet.
600 US gallons = 138,600 cubic inches = 80.208333... cubic feet = 2.9707 cubic yards. (rounded)
1 cubic inch of water weighs 16.4 (16.3961) grams.