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The term LECA stands for Lightweight Expanded Clay Aggregates. They are small, round, brown balls and are available in different sizes for various applications. As a growing medium, the typical size is between 4-10mm (0.15-0.4 inch). These light porous balls are commonly used in horticultural applications and water purification processes.
For plant use, leca is a great way to alter soil chemistry to benefit plants or as its own growing medium. It works best for plant growth when used in aquaponics and hydroculture applications.