Refill - 'Virgin' polystyrene beans

Our beans are a quality 'virgin' polysterene bean from our supplier in the South West. Supplied in a net to avoid spillage, the following quantities (in Cubic Feet) are needed for the following beds: 

25" Bed - 1.5 cu ft / 30" Bed - 2.5 cu ft / 35 Bed - 3 cu ft / 40 Bed - 4.5 cu ft /

45 Bed - 6.5 cu ft / 50 Bed - 9 cu ft / 55 Bed - 10 cu ft / 58 Bed - 12.5 cu ft