Product Features:
1. Our Volcanic Stones are naturally very porous and naturally contains sodium, magnesium, aluminum, silicon, calcium, titanium, manganese, iron, phosphorous, nickel, and other minerals to help purify water quality.
2. Absolutely safe: This product series is clean, poison-free, odorless, and insoluble in water.
3. Environmentally sound: Our Volcanic Stones can be used for one year without changing shape or having to be replaced.
4. Multipurpose: Volcanic Stones can be used in many different kinds of filtering systems, and are acid proof, alkaline-resistant, and suitable for use in salt water.
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