A hydro system which circulates or “feeds” nutrient solution from a reservoir over and over again, until the reservoir is either “topped off” with additional nutrients or drained out completely and replenished. Ebb & flow (flood & drain) is the most common recirculating system in hydro, although NFT (nutrient film technique) and drip systems can also recirculate nutrient solution.
All Glossary
Recirculating system
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