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Expanded clay aggregate (LECA) from Professor's Nutrients, used as an inert growing medium and as a drainage layer.
The pebbles are 100% natural, lightweight and pH neutral, so they hold their shape and do not feed or buffer the plant — everything the crop receives comes from the solution you supply, which makes a system predictable to run. They drain quickly and hold air around the roots, and they can be washed and reused between crops.
Suits flood and drain, drippers, DWC and net pots, and works as a base layer for drainage in larger containers.
