I had 220lbs of sand in my tank at about 6" deep so 3 cu^ft is about 220 lbs so yours is the same but only 4" deep so about 2 cu^ft..... about 150ish lbs.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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