Germany Lecca 4-8mm (50 Ltr)Germany Lecca is a lightweight natural expanded clay granule specially manufactured for hydroponics use. Lecca can be used as a potting medium for hydroponics, mixed into soil for better ventilation and drainage while maintaining light weight. Lecca can also be used as a top dressing to prevent soil splatters and soil hardening from rain. Characteristics: 100% mineral, inorganic and biological Chemically neutral, structurally stable, odourless and