Aquarium filter flow calculator

Enter collected water and elapsed time. Working tank water is optional and adds a flow-to-volume ratio. The starting values are an arithmetic example.

Collected waterCollected volume unitsElapsed time, secondsWorking water, US gal (optional)

Only collect water where the equipment instructions and installation allow it safely. Keep connections dry and do not run the pump without water or alter its plumbing for this example.

Compare a maker’s model ratings (optional)

Add a rating from your own equipment label

Rating typeYour label rating, US GPH

Keep each rating in its own column

No maker model selected. Your collected-water measurement remains independent.

The flow-label guide explains why unlike ratings cannot be substituted. A collection measurement is a snapshot of your installation, not a maker specification or a promise about every operating condition.

Compare the same installation over time

Keep the volume, elapsed time, operating water level and filter condition beside the result. Changes to media, hose routing or settings change the comparison. Do not use a lower reading alone to diagnose a fault.

Use manual-led filter maintenance for routine service or the symptom router for an unexpected change. To compare purchases, open the filter catalog.