When to use
- Sizing pumps for new tank systems
- Planning water exchange schedules
- Adjusting flow after changes in stocking density
- Emergency water quality management
ToolsConductScience tool
AquacultureFree in-browser calculator
Water Exchange Flow Calculator.
Calculate the pump flow rate needed for a target water exchange. Results in L/min and L/hr for easy pump sizing.
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Validated2026-04-08
CitableMethods and citation included
Calculator
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Load example water exchange data to see the full workflow
Exchange Parameters
Results
41.7 L/minrequired flow rate
2500 L exchanged over 1 hour
Flow Rate
41.7 L/min
liters per minute
Flow Rate
2500 L/hr
liters per hour
Volume Exchanged
2500 L
25% of tank
Do not use for
- For RAS biofilter sizing — this calculates exchange, not recirculation flow
- Without considering head pressure — actual pump selection needs total dynamic head calculation
Exchange rate vs. turnover rate
Water exchange (replacing with fresh water) is different from recirculation turnover (water circulating through filters and back). This tool calculates exchange.
Temperature matching
Incoming water should be temperature-matched to the tank. Large temperature differentials during exchange stress fish.
Chlorinated water
If using municipal water, dechlorinate before adding to fish tanks. Chlorine is lethal to fish at very low concentrations.
1
Method
Exchange Volume = Tank Volume x Exchange%. Flow Rate = Exchange Volume / Time. Results provided in L/min and L/hr for pump selection.
2
Validated
Last validated 2026-04-08. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.
3
How to cite
How to Cite
ConductScience Water Exchange Flow Calculator (v1.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/water-exchange-flow-calculator
Timmons MB, Ebeling JM. Recirculating Aquaculture. Ithaca Publishing. 2013.
Water Exchange in Aquaculture Systems
Water exchange is fundamental to maintaining water quality in aquaculture. It dilutes accumulated metabolic wastes (ammonia, nitrite, ) and replenishes minerals and dissolved oxygen. The required exchange rate depends on stocking density, feeding rate, and biofilter capacity. This tool calculates the pump flow rate needed to achieve a target exchange percentage within a specified time window.
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