Volcanic stone (also known as porous basalt or lava stone) is a natural eco-friendly igneous rock formed by volcanic lava rapidly cooling with trapped gas bubbles. Composed mainly of silica (SiO₂, 50%–60%), alumina, iron oxide, calcium, magnesium, and rich in trace elements like sodium, potassium, and titanium, it features a unique honeycomb porous structure (porosity 20%–40%), high surface area, strong adsorption, chemical inertness, wear resistance, and heat insulation. Non-radioactive and safe, it is widely used in water treatment, environmental protection, construction, landscape, and agriculture.

Raw volcanic stone is processed via crushing, screening, washing, and drying to remove impurities. High-quality grades have uniform pore size (0.1–2mm), high mechanical strength (≥15MPa), and stable pH (6.5–8.5), ensuring durability and consistent performance in filtration and construction.

Its porous, rough surface is ideal for biological filtration:

• ◆ Municipal & Industrial Wastewater: As bio-filter media in aerated filters, it removes COD, ammonia nitrogen, and heavy metals; extends service life vs. activated carbon.
• ◆ Drinking Water & Aquariums: Replaces quartz sand/activated carbon to adsorb impurities, chlorine, and cultivate nitrifying bacteria for clear water.
• ◆ Stormwater & Sewage Deep Treatment: Reduces pollutants to meet reuse standards.

Combines light weight, heat insulation, sound absorption, and slip resistance:

• ◆ Exterior & Interior Walls: Natural texture, fireproof, weather-resistant; ideal for villas, hotels, and cultural spaces.
• ◆ Landscape & Paving: Anti-slip, durable for driveways, patios, and garden rockeries.
• ◆ Lightweight Insulation: Low thermal conductivity for roof insulation and fire-resistant linings.
• ◆ Soilless Culture & Soil Amendment: Porous structure improves aeration/drainage; releases trace elements to promote root growth (succulents, orchids).
• ◆ Animal Bedding & Feed Additive: Absorbs moisture/odor; supplements minerals for livestock/poultry.