Triple washed and kiln dried - this is one of the cleanest aquarium sands available, no toxins, no foreign matter, 100% natural sand 0.8 - 1.2mm in size - it has a dense composition and low fines so does not blow around in your tank Ethically and sustainably sourced under license in the USA This sand is reminiscent of the rich soil of the Mississippi Delta Wetlands, with dark browns and earthy tones. It matches well with aquarium plants and goes with any décor, great for vivariums and terrariums also