HYDROGRAN, LECA, HYDRO CLAY, Lecca Clay Hydroponic Pebbles also known as Lightweight Expanded Clay Aggregates Aacc230

German 8-16mm Size Lecca Natural Granulate Clay Ball 10 Litres (Approx. 4kg).Made of 100% natural clay. Pebbles are of uniform, round shape. Inert, pH-neutral, clean and decorative. For Orchids - porous structure provides excellent aeration and acts as a water reservoir. The size of the pebbles is perfect for medium to large Cattleyas and Laelias. For Hydroponics - Ensures good root aeration and prevents rotting, excess acidity and soil pests Clay Balls are baked and sterilised clay pellets that form an ideal substrate for use by beginners to experienced growers. Their unique structure makes the clay balls the ideal basis for growers who want to control the application of nutrients and the humidity level of their plants throughout the entire process of cultivation in a simple way Strong structural integrity means that they are less likely to break and compact, which helps to prevent dripper systems from getting blocked Pre-washed to aid in stability Drains freely and does not hold any excess water, providing good oxygen levels around the root; suitable for flood and drain systems, multi-pot and drip feed system. 2 sizes available: 4-8mm, & 8-16mm. 10 liter (5.4kgs) bags. Both sizes are same prices.