Things You'll Need
- Kitchen strainer with a tight mesh weave (if cleaning loose charcoal)
- Replacement activated charcoal cartridges or loose charcoal (depending on filter type)
Instructions
Remove the filter from the tank if possible after turning off the electrical supply and shutting off any water shut-off valves depending on filter type.
Carry the filter over to a sink or tub, moving carefully so no dirty aquarium water spills out onto carpets, rugs or other flooring.
Remove the loose charcoal or charcoal cartridge from the filter, depending on filter type.
Place the carbon in the mesh kitchen strainer and run warm water through the charcoal to rinse out impurities if using loose charcoal. If using charcoal cartridges, allow warm tap water to run through the cartridge for several minutes.
Hold the rinsed charcoal up near your ear. If you hear a sort of subtle crackling or popping noise emanating from the charcoal, place it back into the filter. If you hear nothing, the charcoal is no longer activated and should be replaced with fresh carbon.