Medium
 
PLANT!T Clay Pebbles 
The Hydro Clay Pebbles are burned in kilns where the clay is expanding into small 'Pebbles'. The firing process removes all excess organic material. These grow pebbles consist of thousands of tiny air cells with a hard shell of baked clay. This provides additional oxygen to the root system enabling the plants to thrive.
Coco Coir
Coco Peat is also known as Coir pith. The 5kg compressed blocks are made from Coconut husk.
Coco peat blocks can be used as a soil additive or by itself. By adding water, the compressed blocks expands 8 times its compressed size equivalent to a 75 liter volume!
Coco peat will keep roots aerated and hydrated at the same time. One 5 kg coco peat block can hold up to 80 liters of water. Coco peat will retain water extremely well.
5Kg Block = (6) 18" Stacky Pots or (16) 13" Stacky Pots
Size: 11.8 x 11.8 x 3.94 inches
Weight: 11 lbs. (5 Kg)
pH: 5.5 – 6.8
Electrical Conductivity (EC): < 0.5 ms/cm
Water holding capacity: 8 to 9 times
Compression Ratio: 8:1
Expansion: 75 liters = 79 Quarts = 2.65 Cu Ft