The Unipac brand have been supplying the aquatic and reptile trade for many years with quality substrates and decor. This Unipac Nordic gravel is a great natural product for creating neutral landscape and scenes within an aquarium or on model display like railways and warhammer scenery etc.
Also available in other sizes
As a very rough guide for every 1ft length of Aquarium approx 10Kg of sand or gravel is required. This will give approx depth of 1.5" or 40mm
The calculation is as follows
Length x Width divided by 10. This then give the weight required in Lbs. To convert this to KG just divide the answer by 2.2
For example on a 4ft x 1.5ft long tank
48(inches) x 18(inches) = 864 divided by 10 = 86.4(lbs) divide again by 2.2 = 39.27KG