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PUREFLOW BIO / ENGINEERING FIELD GUIDE

Drum Filter for HydroponicsDrain Water Filtration Guide

Drum filter for hydroponics and greenhouse drain water: what is in the drain, drum filter versus settling tank and sand filter, where it sits in the loop, which micron screen to use, and how to size it.

Explore the process ↗Open the workbench
14 MIN GUIDEUPDATED NOVEMBER 2026
A drum filter for greenhouse drain water.EQUIPMENT REFERENCE
Equipment reference illustration. Confirm the supplied model configuration and installation arrangement from its approved documentation.
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.
Rotary drum screen and separate waste routePUREFLOW / INTERACTIVE PROCESS ATLASCONCEPT LAYOUT · NOT TO SCALECULTURE WATERSCREEN + SPRAY + DRIVEDOWNSTREAM BIOLOGYWASH WASTE OUTWASH SUPPLYMotion explains the process; it is not a measured flow rate or biological time model.
Follow water across the screen and toward the downstream treatment. The line speed is illustrative.
Selected process stage

Capture solids

Use actual flow, screen opening and solids duty.

How it works

Particles are retained as water crosses the screen. Dissolved contaminants require other treatment stages.

What to establish
  • Use actual flow, screen opening and solids duty.
  • Confirm approved levels, wash supply and waste drainage.
  • Observe a complete guarded cycle before changing settings.

Continue this guide ↗

Filtration mode. Wash sequence and timing are illustrative. Geometry, stage order, pipe routes and equipment configuration are conceptual. Use the approved project design, operating instructions and verified model data.

Key takeaways

  • Drain water carries particles that block emitters and feed disease, so it should be screened before it is reused.
  • A drum filter does the screening continuously and cleans itself, which saves a settling tank and a lot of labour.
  • It removes particles, not dissolved nutrients and not microbes. Disinfection is a separate stage.
  • Size it from the peak drain flow, not from the daily volume.
A drum filter for greenhouse drain water.
A drum filter for greenhouse drain water.
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.

Hydroponic return-flow scenario

Convert a daily irrigation plan and drainage fraction into an average return flow.

Assumptions and limits

Average flow can be far below short irrigation peaks. Measure the peak and account for solids, chemistry and disinfection before selecting equipment.

—Irrigation · m³/day
—Drainage · m³/day
—Average return flow · m³/h
Enter your values, or load the labelled arithmetic example. No design values are pre-filled.
FormulaDaily drainage m³ = area × application × drainage share ÷ 100,000. Average return flow = drainage ÷ hours.
Convert units before you calculate
Choose units and enter a value.

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

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.

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