How do I know my filter capacity?

Filter capacity is specified by the manufacturer, typically in grams of ammonia or total organic load the media can process before saturation or replacement.

What affects filter life?

Biomass, feeding rate, and water temperature all affect filter loading. Higher temperatures increase bacterial activity and waste production.

What happens if I do not replace the filter on time?

Saturated filters stop removing waste, leading to ammonia and nitrite spikes that can stress or kill fish.

ToolsConductScience tool

AquacultureFree in-browser calculator

Filter Life Estimator.

Estimate when your aquaculture filter needs replacement based on biomass and feed load. Never miss a filter change.

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Validated2026-04-08

CitableMethods and citation included

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Load example filter life estimator data to see the full workflow

Filter Parameters

Biomass (kg)

Feed Rate (g/day per kg biomass)

Filter Capacity (g)

Results

Days Left

until replacement

Daily Load

2,500 g/day

feed waste load

Capacity

50,000 g

total filter

Replace By

6/29/2026

estimated date

When to use

Planning filter replacement schedules
Estimating filter media costs
Scaling filtration for biomass growth
Maintenance calendar planning

Do not use for

For biological filters that self-regenerate (e.g., biofilters with nitrifying bacteria colonies)

Feed rate changes

As fish grow, feed rate per kg decreases but total feed increases. Update calculations monthly.

Temperature spikes

Sudden temperature increases can accelerate organic decomposition and shorten effective filter life.

Method

Days remaining = filter capacity (g) / daily feed load (g). Daily feed load = biomass (kg) $\times$ feed rate (g/day per kg).

Validated

Last validated 2026-04-08. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.

How to cite

How to Cite

ConductScience Filter Life Estimator (v1.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/filter-life-estimator

Timmons MB, Ebeling JM. Recirculating Aquaculture. Ithaca Publishing. 2013.

Filtration in Aquaculture

Biological and mechanical filters are essential in recirculating aquaculture systems (RAS). Filter media has a finite capacity determined by the organic load it processes. Feed is the primary source of organic waste, so filter life is directly proportional to daily feed input. Proactive filter replacement prevents water quality crashes.

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