Viastone Expanded Clay Pebbles – Premium Growing Medium Viastone is an ecologically sustainable growing medium derived from renewable and plentiful clay, offering versatility and high performance in various gardening applications. Whether used in hydroponics, aquaponics, indoor or outdoor gardening, propagation systems, or rooftop gardens, Viastone provides superior drainage, aeration, and root oxygenation, ensuring your plants thrive. Its neutral pH and lightweight nature make it a premium growing medium suitable for all plant types. Specifications: Specification Details Size Available in 50L and 10L quantities (1 trade gallon = 0.71 U.S.