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PUREFLOW BIO / ENGINEERING FIELD GUIDE

Deep Water CultureSetup, Oxygen and Common Problems

Deep water culture (DWC): how rafts and aerated solution work, setup, oxygen, temperature, nutrient management, best crops and common problems.

Explore the process ↗Open the workbench
9 MIN GUIDEUPDATED NOVEMBER 2026
Concept illustration of greenhouse growing beds, roots, a reservoir and return-water treatment.SYSTEM CONCEPT
AI-generated educational concept illustration; not a Pureflow installation photograph or an approved construction drawing.
01Understand the mechanismInspect the relevant process stages.
02Review the operating dutyKeep assumptions and measured values visible.
03Prepare the next decisionUse the guide, tools and project checks.
INTERACTIVE PROCESS ATLAS

See the mechanism.
Understand the duty.

Select a route or a stage to inspect the process. The cutaway explains the equipment and water environment; it is a teaching illustration, not a project drawing.

Swipe horizontally to inspect the equipment. Stage buttons below also centre the selected component.
Recirculating nutrient solution and root zonePUREFLOW / INTERACTIVE PROCESS ATLASCONCEPT LAYOUT · NOT TO SCALEROOT ZONE / IRRIGATIONMANAGED RESERVOIRRETURN-WATER TREATMENTMEASURED SUPPLYMotion explains the process; it is not a measured flow rate or biological time model.
Managed solution reaches the growing system and returns through the defined collection route.
Selected process stage

Supply the roots

Use measured irrigation and peak return duty.

How it works

A managed nutrient solution reaches the growing system at a flow suited to its design.

What to establish
  • Use measured irrigation and peak return duty.
  • Record nutrient chemistry, temperature and root-zone conditions.
  • Coordinate treatment with the growing method and crop programme.

Continue this guide ↗

Motion explains direction and mechanism; it does not represent measured performance. Geometry, stage order, pipe routes and equipment configuration are conceptual. Use the approved project design, operating instructions and verified model data.

Key takeaways

  • Roots must always have oxygen. Use air stones and keep solution cool.
  • Keep solution temperature about 18 to 24 °C.
  • Best for lettuce, herbs and other leafy greens.
  • Filter and disinfect in larger systems.
Reference illustration for Deep Water Culture: Setup, Oxygen and Common Problems
Equipment reference visual; not evidence of a completed installation.
THE SHORT ANSWER

How dwc works

Plants sit in holes in rafts floating on a tank of nutrient solution. Air stones keep oxygen high and the solution mixed. Roots take water and nutrients directly.

Deep Water Culture - Pureflow Bio
Reference visual. Equipment configuration and project details must be confirmed separately.
HYDROPONICS

Setting up

  1. Build the tankOpaque, food-safe, sized for the crop.
  2. Add aerationAir pump and diffusers.
  3. Place raftsNet pots with plants.
  4. Mix solutionSet EC and pH.
  5. MaintainCheck daily.
Deep Water Culture - Pureflow Bio
Reference visual. Equipment configuration and project details must be confirmed separately.
PLANNING WORKBENCH

Work with your own numbers.

Use the tools below to explore the relevant arithmetic. Enter measured values or declared assumptions. An estimate does not establish equipment capacity, biological performance or a safe operating limit.

Dissolved-oxygen mass inventory

Convert measured dissolved concentration and water volume into the mass currently dissolved.

Assumptions and limits

This is an inventory, not oxygen-delivery capacity or safe survival time. Fish, bacteria, transfer efficiency and changing demand require a separate oxygen balance.

—Dissolved oxygen inventory · g
Enter your values, or load the labelled arithmetic example. No design values are pre-filled.
FormulaDissolved oxygen grams = volume in m³ × concentration in mg/L.
Convert units before you calculate
Choose units and enter a value.

Planning arithmetic · inputs remain visible for review · example values are not operating recommendations

HYDROPONICS

Oxygen and temperature

Warm water holds less oxygen and encourages root rot. See temperature and oxygen.

HYDROPONICS

Nutrients

See EC and pH.

HYDROPONICS

Common problems

  • Root rot, usually warm or stagnant water.
  • Algae from light.
  • Pump failure: roots suffocate fast.

Pureflow Bio equipment for this

Standard drum filters (RDF) →Solids removal for recirculating nutrient solution.UV disinfection systems →UV-C to control pathogens and algae.
PROJECT REVIEW

Use the real irrigation return

Use these questions to prepare a project brief or an operating review. Check an item only when the information has been recorded for your installation.

0 of 3 checked

This checklist is a working aid in the current page session, not a saved maintenance record.

QUESTIONS

Deep Water Culture FAQ

Is DWC good for beginners?

Yes. It is simple and forgiving.

What crops suit DWC?

Leafy greens and herbs.

Do I need to change the water?

Periodically, based on tests.

KEEP READING
NFT vs DWC vs drip→Hydroponic temperature→Hydroponics→Nutrient solution→Drum Filter for Hydroponics: Drain Water Filtration Guide ↗Hydroponic Algae Control: Light, Nutrients and UV ↗

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