Kempf Compressed Coco Coir Pith Block, 10 Pound Block, Natural Potting Mix, Expands to 18 Gallons Description Made from sustainable raw coconut fiber, coco pith is a hydroponic growing medium. The Coir Block is a compressed growing medium that expands to 17 gallons of potting mix. Compressed coir growing medium, expands to 50 litres , each block is 10 lbs in weight. Good water retention for plants Features: High water retention, pith can act as the perfect soil conditioner. It can retain moisture up to eight times of its volume. 100% Natural Organic and Eco Friendly Each block expands to 17 gallons of potting mix Product Details: Product Dimensions: 11 x 11 x 5 inches Item Weight: 10 pounds Manufacturer: William F. Kempf & Son Inc. Item model number: 2214 Is Discontinued By Manufacturer: No