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PUREFLOW BIO / ENGINEERING FIELD GUIDE

Aquaponics Cycling and Start-UpThe First Six Weeks

How to cycle a new aquaponics system, add fish and plants in the right order, and what to test as bacteria establish.

Explore the process ↗Open the workbench
6 MIN GUIDEUPDATED NOVEMBER 2026
Concept illustration connecting fish tanks, water treatment and leafy crop growing beds.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.
Connected fish and plant treatment dutiesPUREFLOW / INTERACTIVE PROCESS ATLASCONCEPT LAYOUT · NOT TO SCALEFISH SIDESOLIDS + BIOLOGICAL DUTYCROP SIDERETURN, CHEMISTRY AND THE WATER BALANCECOUPLED CONCEPT SHOWN · A SEPARATED-LOOP DESIGN NEEDS A DIFFERENT INTERFACEMotion explains the process; it is not a measured flow rate or biological time model.
The fish side creates a solids and dissolved-waste duty that must be managed before the intended crop interface.
Selected process stage

Define the fish load

Define the fish feed input and crop-growing method.

How it works

Feed and the fish production stage establish solids and dissolved-waste loading on the fish side.

What to establish
  • Define the fish feed input and crop-growing method.
  • Review solids removal and biological treatment.
  • Balance both water programmes; plant area does not prove fish capacity.

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

  • Cycle first: Run the pumps and aeration, add an ammonia source and test.
  • Add plants early: Seedlings can go in while cycling.
  • Add fish gradually: Stock lightly, then increase feeding in small steps as the system proves it can cope.
  • What to test: Ammonia, nitrite, nitrate and pH every day or two at first.
Reference illustration for Aquaponics Cycling and Start-Up: The First Six Weeks
Equipment reference visual; not evidence of a completed installation.
THE SHORT ANSWER

Cycle first

Run the pumps and aeration, add an ammonia source and test. Wait until ammonia and nitrite fall to zero and nitrate begins to appear. See biofilter start-up.

Aquaponics Cycling and Start-Up - Pureflow Bio
Reference visual. Equipment configuration and project details must be confirmed separately.
AQUAPONICS

Add plants early

Seedlings can go in while cycling. They will start slowly at first, so do not expect fast growth.

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.

Aquaponics feed-to-area scenario

Relate plant area to a chosen feed-rate ratio and a selected biomass feeding rate.

Assumptions and limits

Crop, fish, feed and nutrient availability determine the suitable ratio. The implied biomass is not a stocking recommendation or proof of nutrient balance.

—Daily feed scenario · kg
—Implied biomass · kg
Enter your values, or load the labelled arithmetic example. No design values are pre-filled.
FormulaFeed kg/day = area × feed-rate ratio ÷ 1,000. Implied biomass kg = feed ÷ (feeding rate ÷ 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

AQUAPONICS

Add fish gradually

Stock lightly, then increase feeding in small steps as the system proves it can cope.

AQUAPONICS

What to test

Ammonia, nitrite, nitrate and pH every day or two at first. Keep pH in a range that suits both fish and plants.

AQUAPONICS

Be patient

A slow start gives a stable system. Rushed systems crash.

Pureflow Bio equipment for this

All aquaculture equipment →Pumps, tanks, oxygen and filtration.MBBR biofilters →Moving bed biofilters.
PROJECT REVIEW

Balance both living systems

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

Aquaponics Cycling and Start-Up FAQ

Can I plant straight away?

Yes, but expect slow growth until nutrients build up.

Why is my pH falling?

Nitrification uses alkalinity. See the alkalinity article.

KEEP READING
Aquaponics→Aquaponics build→Biofilter start-up→Aquaponics Filtration: Solids, Biofilters and Water Treatment ↗Aquaponics Problems and Fixes: Yellow Leaves, Low pH and Sick Fish ↗

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