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Expanded Clay Also known as 'hydroton' or 'leca' (light expanded clay aggregate), trademarked names, these small, round baked spheres of clay are inert and are suitable for hydroponic systems in which all the nutrients are carefully controlled in the water. Clay pebbles can be reused provided they are cleaned thoroughly between crops. Baked clay pebbles are highly porous, yet irregularly shaped to create a balance of air, space and nutrient solution. |
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