Green Paradise Expanded Clay Balls 3 Litres Clay Balls, Hydrotons, Lightweight Expanded Clay Aggregate (LECA) for Hydroponics, Aeroponics & Aquaponics, Size-8-15mm

  It is produced in large rolling kilns that 'bake' it into its final shape. Since high temperatures are used, hydroton comes to the gardener as a sterile product. This is highly beneficial because you don't want to introduce disease and harmful bacteria into your garden.

Water Retention & Drainage - This material is filled with tiny pores, much like a 'micro sponge'. Because of this, it holds the perfect amount of water and drains any excess to prevent overwatering.