Recirculating deep water culture is a hydroponic system in which several DWC sites are connected by pipes to a control bucket or reservoir, and a pump moves solution continuously through the whole loop. Each site is aerated, and adjustments to pH, EC and temperature are made in the control bucket only.
In practice
The larger shared volume is more stable than single buckets, and one chiller can cool the whole system. Growers typically size the pump to turn over the full system volume several times per hourbeing reviewed. Keep the control bucket accessible, insulate and lightproof all buckets and lines to stop algae and heat gain, and keep the solution around 18-21 °C (64-70 °F).
The trade-off is shared risk: a root disease or pump failure affects every plant at once. Most growers run either a beneficial-microbe reservoir or a fully sterile one.
Don't confuse with
- DWC: one standalone bucket.
- Ebb and flow: also recirculates, but floods and drains a tray instead of holding roots in solution.
DWC (deep water culture) suspends a plant's roots in an aerated nutrient solution, typically in a bucket with a net pot lid and an air stone.pH measures how acidic or alkaline a solution is on a 0–14 scale; in growing it controls nutrient uptake, with soil best near 6.0–7.0 and hydro 5.5–6.5.EC (electrical conductivity) measures how well a solution conducts electricity, a proxy for total dissolved salts; growers read it in mS/cm to gauge nutrient strength.A chiller is a refrigeration unit that cools hydroponic nutrient solution, keeping it around 18-21 °C so it holds more oxygen and root pathogens are discouraged.Decay of roots by pathogens such as Pythium, Fusarium, Rhizoctonia or Phytophthora, usually triggered by low oxygen, heat and waterlogging around the roots.A beneficial-microbe reservoir deliberately inoculates hydroponic solution with helpful bacteria and fungi so they occupy the root zone before pathogens can; GenetixBay prefers this approach.Ebb and flow (flood and drain) periodically floods a tray of potted plants with nutrient solution, then drains it back to a reservoir, pulling fresh air into the medium.Runoff is the water or nutrient solution that drains out of the bottom of a container after irrigation; growers test it to see what is happening in the root zone.A reservoir is the tank that holds a system's water or nutrient solution, the place where pH, EC, temperature and oxygen are measured and adjusted.Dissolved oxygen (DO) is the amount of oxygen gas held in water or nutrient solution, measured in mg/L, and roots need it to respire and take up nutrients.A recirculating (closed) system returns drained nutrient solution to the reservoir to be reused, saving water and nutrients but needing more monitoring and sanitation.
