The Lifegard Hang-On Filter HOF-10 is a SINGLE stage slim design filter with ONE combination replicable cartridge. Flow rate of 90 GPH provides enough circulation for the recommended tank capacity. It is designed to keep your aquarium water sparkling clean with three full stages of filtration while giving you the ability for surface skimming to remove floating debris. The Filter Cartridge is Three-stages:
Stage 1 – Is a 40 micron removable sponge
Stage 2 – Is Activated Carbon
Stage 3 – Is 20 Micron Filter Pad
The top control system knob lets you slow down the water output, creating a gentle flow to protect delicate fish and plants.