On thier site(Premier Horticulture)they have a FAQ section.It states that .5cubic foot compressed will yield 1 cubic foot of material when properly loosened.They also have a neat cost and volume calculator section for trays and containers,just punch in the numbers and hit enter.Also they have a wide range of pro mix products so using the word pro mix would not be definitive as would be using the actual name of thier product(i.e.promix hp,pro mix bio,loose,compressed etc.
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