How often should I change the filter in my aquarium?

I have half tetra whisper filter … How often should I change the carbon canister? I have two fish in a 5 gallon tank.

IDK i was a 3-liter tank and I changed the water every 2-3 days

Aquarium Tetra AquaArt 30 litres (10 gallons)

Purely Products PUVH2309 9-Watt UV-C Germicidal Ultraviolet Replacement Bulb $8.03 Purely UV-C Replacement Bulbs G23 BasePurely UV-C Replacement bulbs offer a much higher concentration of ultraviolet light than even the sun, making them highly effective as a cleaning and purifying agent for pond and aquarium pumps and clarifiers.What is UV and How Does it Work?UV light is germicidal – i.e., it deactivates the DNA of bacteria, viruses and other pathogens and thus destroys their a…

Danner 02527 Pondmaster 700 gph Pump $71.70 Supreme Pondmaster Mag-Drive Utility Pumps – 250 and 700 GPH Pondmaster Pond Pumps – PETCO.comCentrifugal pump designed for the harsh conditions of pond use–ideal for waterfalls and larger statuary. The Mag-Drive Utility Pump is a magnetically driven centrifugal pond pump. It has no seals to wear out and contains no oil to contaminate the pond water. The utility pump can be used submerged or in-l…

Pondmaster 02215 500 GPH Pond Pump with Filter and Fountain Set $110.49 For ponds up to 1,000 gallons, 500 gph flow, pumps 10 1/2 feet high. The complete garden pond filter system includes Pondmaster 1000 with 12″ x 12″ dual filter elements, Supreme Mag-Drive Pump, two free Fountain Kits, and all the connectors, fittings, and filter media. Mag-Drive Pump draws water through the filter and creates fountain effects….

Tetra Pond Thermometer (Catalog Category: Aquarium / Pond Supplies) $8.20 Tetra Pond Thermometer. Feed your fish based on water temperature Color coded temperature scale shows when to feed and which food to feedRetrieval cord included. Size 75 long…

Pond Bio Active Pressure Filter W/ 18 Watt Uv Clarifier Bp – 2500 – uv (Catalog Category: Aquarium / Pond Liners Filters) $1,024.29 Pond Bio Active Pressure Filter W/ 18 Watt Uv Clarifier Bp – 2500 – uv. Pond bio active pressure filter w/ 18 watt uv clarifier bp-2500-uv…

Proline Pro 5000 Skimmer (Catalog Category: Aquarium / Pond Liners Filters) $1,706.75 Proline Pro 5000 Skimmer. SupremeDanner Inc – Proline Pro5000 Skimmer26H x 24W x 23Weir size opening 11 x 7Maximum pond surface area 800 sq ftMaximum pump capacity 8000 gphStrong cylindrical shaped housing that resists side cave insMade from heavy duty high density polyethyleneAnchoring feature holds skimmer in plaace when buriedLarge adjustable 11 X 7 Weir door for maximum skimming with fish saf…

Tetra 26160 Whisper Bio-Bag Cartridge, Unassembled, Medium, 12-Pack $1.36 Tetra Whisper Bio-Bag Cartridge – Unassembled – 12 packWhisper Bio-Bag Cartridges complete the Whisper Power Filter package for a clean, easy-to-maintain aquarium. Filled with Ultra-Activated carbon, the ready-to-use disposable single packs remove waste particles, odors and discoloration, and are easily changed once a month….

Marineland 0064008 Duetto Mini Filter Media Pack, 2-Pack $2.83 Remove debris mechanically, biologically and chemically. Filter cartridge replacement pack. Sponge And Carbon….

Marineland PC0250SSB H.O.T. Magnum Pro, up to 50-Gallon, 250GPH $66.99 Complete kit includes the HOT Magnum Canister Filter, BIO-Wheel Pro 30. Sleek and silent as a jungle cat, the HOT Magnum is lightweight enough to hang directly on your aquarium, yet it does the heavy duty work of two complete filtration systems–perfect for everyday mechanical/chemical filtration and quick-clean water polishing. Its powerful self-starting pump silently directs a certified 250 gall…