Clay Aggregate

Expanded clay pebbles are used in hydroponics and as a drainage layer in pots. We stock three granule sizes: 1–4mm, 4–8mm and 8–16mm, in volumes of 1, 3, 5, 10 and 25 litres.

The product details describe the larger 8–16mm pebbles as creating more air pockets and stability for bigger plants, and the 4–8mm size as a balance of drainage and support.