Enter the volume of water (in litres) to calculate the flow rate:

[ Calculate ]

NOTES:
* A filter rated at 1000 will give about 7-800 at ground level (with media). Less as it fills with mulm.
* Filter ratings are based on empty canisters.
* Always check external filters max head height as this drastically affects the filters performance.
* The head height stated is the max height the pump is capable of pumping water upto.