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PUREFLOW BIO / ENGINEERING FIELD GUIDE

Drum Filter for AquacultureHow to Size a RAS Drum Filter

Drum filter for aquaculture and RAS: what it does in a fish farm, where it sits in the loop, how to size it by flow and solids load, salt water considerations, and rinse water and sludge handling.

Explore the process ↗Open the workbench
15 MIN GUIDEUPDATED NOVEMBER 2026
A drum filter on a fish farm.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

  • In a RAS the drum filter removes solids first, before they rot and load the biofilter and the fish.
  • Size it from the recirculation flow, then check the solids load and add a margin.
  • Use enough units that one can be serviced without shutting the system down.
  • Plan the rinse water, the sludge and the energy at the design stage, not afterwards.
A drum filter on a fish farm.
A drum filter on a fish farm.
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.

Flow & turnover planner

Relate a measured water volume to a selected turnover time. Confirm the time from the application and hydraulic design.

Assumptions and limits

A planning allowance is your assumption. This calculation does not choose a filter, prove treatment capacity or account for pump head.

—Base flow · m³/h
—Planning flow · m³/h
—Planning flow · L/h
Enter your values, or load the labelled arithmetic example. No design values are pre-filled.
FormulaFlow = volume ÷ turnover time. Planning flow = flow × (1 + allowance ÷ 100).
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

Review the design at peak load

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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