Black lava rock, 3/8 inch

Black lava rock, 3/8 inch, washed and screened at the yard. Choose a 1 lb or 5 lb bag after checking the intended space. The nominal grade describes screened material rather than identical pieces, and loose fragments can be smaller than the most visible specimen in a representative image.

For a contained media compartment, begin with the equipment instructions. Measure usable depth, retaining openings, and the route for removing a filled basket. A small grade is a handling choice, not proof of greater biological capacity. Keep fragments away from moving parts and leave a way to manage collected debris.

An exposed floor is a different use. Consider whether animals sift, mouth, or rest on the material. Rough loose lava is not a default substrate for every fish or reptile. Stable hardscape, contained media, and a buried drainage role need their own checks rather than one broad animal-safe label.

The chemistry of this batch is still awaiting confirmation. We do not promise unchanged pH or hardness, identify every mineral, or approve a soft-water habitat from its black color. A household-vinegar observation would be only one observation, not proof of universal inertness.

Rinse suitable dry material to remove handling fines and inspect the actual pieces before arranging them. The calculator uses an estimated density to help compare approximate volume and bag weight. Its arithmetic does not choose the animal-care use. Check the cart's full bag and box plan. The dry and wet images are representative illustrations until actual product photography is available.