When used for commercial crop production, perlite is contained in 20 to 30 liter perforated bags designed to hold three tomato plants. A constant supply of aerated nutrient solution is maintained in the perlite by sitting the bags in a shallow reservoir of solution formed in the bottom of an outer polyethene gully by a series of polystyrene dams. Perlite's strong capillary attraction for water automatically draws up water from the reservoirs at the same rate as it is lost by evapotranspiration, irrespective of weather conditions or stage of crop growth.
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