NSPI Newsletter - Inspections, Forensics, Supervision requires 2.4 cu. ft. of sand (240 lbs.), HR25...
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NSPI Newsletter - Inspections, Forensics, Supervision requires 2.4 cu. ft. of sand (240 lbs.), HR25 requires 3 cu. ft. Of sand (300 lbs.), and the Model HR31 requires 51/2 cu. ft