NFT Nutrient Film Technique Grow tanks are often referred to as 'pure hydroponics' because virtually no growing medium is used and roots benefit from unrestricted access to oxygen. Nutrient solution is constantly pumped up from the reservoir to the roots in the planting channel and flows back into the reservoir ready to be passed over the roots again.Zero waste - the only growing medium used is the rockwool block the plants were started in. This means there's less chance of disease and less wast
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