Hydroton, otherwise known as lightweight expanded clay aggregate (LECA), hydroton, or clay pebbles, are clay balls that have been expanded to form clay pebbles. They are light, porous, and easy for transplanting and harvesting, making them an excellent choice for hydroponic gardening.
The clay balls and other minerals are heated to 2,000 degrees Fahrenheit using a rotary kiln until they expand and become a rock filled with air bubbles.
When you first start using hydroton, or any other clay pebbles as a medium, you definitely want to wash the pebbles first to get off all the dust and dirt there is. Just soak in the sink and then put in a strainer and wash off as you put into your buckets or table. I have been using the same hydroton clay pebbles for over 20 years, below you will find a video on how to clean them after a grow to reuse.
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