Expanded perlite is physically stable and chemically inert. The porous nature of the cellular granules ensures a product that is light to handle, holds large quantities of readily available moisture and has a strong capillary attraction for water. Since it is free draining, it is also well aerated.
Its neutral pH, negligible nutrient content and a complete freedom from pests, pathogens and weed seeds combine to make this an ideal rooting medium for hydroponic culture.
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