Deep Sea Aquarium ornamental gravel

Aquarium ornamental gravel
The aquarium decorative gravel from Deep Sea in the color black is available in various grain sizes. With the gravel you can design your aquarium great. But wash the gravel before use a few times thoroughly with lukewarm water to prevent dirt and dust in the aquarium.
How much gravel / sand do I need for my aquarium?
Calculation formula: (length(cm) x width (cm) x gravel height (cm) x 1.6): 1000 = kg gravel/sand
Example:
For an aquarium 100x50x50cm and gravel height 8cm calculate: (100 x 50 x 8 x 1.6) :1000= 64kg.