It's top feed - but it is free flow from a 1/4" inch microtube connected to 5/8" hose. Each plant site has its own feeder line. The water ebbs & flows , then it drains from the grow troughs onto a secondary area of root containment - which is similiar to NFT which is under the grow troughs. The roots grow up to 10 feet just in the NFT sections alone.
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