KoirChip™ block is an organic potting medium made from natural coconut fibers. This all-natural material is not just ideal for hydroponics and mixed media cultivation but is also an excellent soil conditioner. It holds more water, air and nutrients than bark chips and does not dry out quickly. KoirChip™ blocks maintain the air circulation just as good as bark. It contains five times more lignin than bark, which makes them highly resistant to decay. KoirChip™ Blocks are mostly used by wholesale nurseries and large retailers