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PUREFLOW BIO / ENGINEERING FIELD GUIDE

Sump and Pump Station DesignWhere the Clean Water Goes

How to design the sump or pump station after a gravity-fed filter: volume, level control and pump protection.

Explore the process ↗Open the workbench
6 MIN GUIDEUPDATED NOVEMBER 2026
Reference illustration for Sump and Pump Station Design: Where the Clean Water GoesEQUIPMENT 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.
Pump and pipework hydraulic dutyPUREFLOW / INTERACTIVE PROCESS ATLASCONCEPT LAYOUT · NOT TO SCALESUCTION CONDITIONSIMPELLER / VOLUTEMEASURE THE DUTYTREATMENT RESISTANCEACTUAL FLOW COMES FROM THE PUMP AND SYSTEM CURVESMotion explains the process; it is not a measured flow rate or biological time model.
The pump transfers hydraulic energy to the water. Its headline flow is not the same as the delivered system flow.
Selected process stage

Supply the pump

Check the complete pump and system duty.

How it works

Maintain the approved suction arrangement and avoid dry running or air ingress.

What to establish
  • Check the complete pump and system duty.
  • Use internal pipe dimensions and measured operating flow.
  • Review supply conditions, protection and service isolation.

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

  • Why a sump: It decouples the filter from the pumps, holds a working volume and gives you one place to add heaters, skimmers or dosing.
  • Size: Large enough that the pump does not start and stop too often, and that power loss does not flood the sump.
  • Level control: Fit float switches or sensors for low-level pump protection and a high-level alarm.
  • Pump protection: Keep the pump inlet well submerged and away from air-entraining flows.
Reference illustration for Sump and Pump Station Design: Where the Clean Water Goes
Equipment reference visual; not evidence of a completed installation.
THE SHORT ANSWER

Why a sump

It decouples the filter from the pumps, holds a working volume and gives you one place to add heaters, skimmers or dosing.

Sump and Pump Station Design - Pureflow Bio
Reference visual. Equipment configuration and project details must be confirmed separately.
GRAVITY-FED OR PUMP-FED

Size

Large enough that the pump does not start and stop too often, and that power loss does not flood the sump. Allow for the water that drains back when pumps stop.

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.

Pump or equipment energy cost

Estimate electrical use from measured input power and a declared daily operating schedule.

Assumptions and limits

Use electrical input, not hydraulic power or the pump’s flow rating. Starting load, variable duty, taxes and demand charges are not included.

—Energy · kWh/day
—30-day energy · kWh
—30-day energy cost · INR
Enter your values, or load the labelled arithmetic example. No design values are pre-filled.
FormulakWh/day = watts × hours ÷ 1,000. Monthly estimate uses 30 days.
Convert units before you calculate
Choose units and enter a value.

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

GRAVITY-FED OR PUMP-FED

Level control

Fit float switches or sensors for low-level pump protection and a high-level alarm. Add a top-up arrangement if evaporation matters.

GRAVITY-FED OR PUMP-FED

Pump protection

Keep the pump inlet well submerged and away from air-entraining flows. See choosing a pump.

GRAVITY-FED OR PUMP-FED

Access

Leave room to service pumps and clean the sump.

Pureflow Bio equipment for this

Standard drum filters (RDF) →Automatic solids removal.Pro drum filters →Compact pump-fed drum filters.
PROJECT REVIEW

Coordinate the levels and losses

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

Sump and Pump Station Design FAQ

How big should the sump be?

Big enough for drain-down volume plus a working buffer.

Can the sump hold the biofilter?

Often yes in small systems. Large systems keep them separate.

KEEP READING
Gravity or pump-fed→Water circulation pumps→Drum filter vs sump→Gravity-Feed Pipework Design: Slopes, Levels and Air Locks ↗

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