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Filter Media
The right aquarium filter media helps keep your fish tank water clean, clear and healthy by removing waste, trapping debris and supporting the beneficial bacteria that keep your aquarium stable.
Aquarium filtration generally uses three main types of media: mechanical, biological and chemical filtration. Each has a different job, and using the right combination can make a big difference to water quality.
At Aquaholics Online, you'll find filter media for freshwater and marine aquariums, canister filters, internal filters, sumps and other aquarium filtration systems.
Shop Aquarium Filter Media by Type
Biological Filter Media
Biological filter media provides a large surface area for beneficial bacteria to establish and grow.
These bacteria form an essential part of the aquarium nitrogen cycle. They help process harmful ammonia and nitrite produced by fish waste, uneaten food and other organic material.
Common biological media includes ceramic rings, porous media and products such as Seachem Matrix.
Mechanical Filter Media
Mechanical filter media physically traps particles and debris as aquarium water passes through the filter.
This can include fish waste, uneaten food, plant material and other suspended particles that can make aquarium water look cloudy or dirty.
Mechanical filtration includes products such as:
- Filter wool and filter floss
- Fine filter pads
- Coarse filter sponge
- Replacement foam
- Jap mat and filter matting
Coarse media is usually used first to trap larger debris, while finer filter wool or floss can be used later in the filtration process to help polish the water.
Chemical Filter Media
Chemical filter media is used to remove selected dissolved substances from aquarium water.
Activated carbon is one of the most common forms of chemical filtration and can help remove discolouration, odours and some dissolved organic compounds.
Other specialised chemical media can be used to target substances such as phosphate or other unwanted compounds, depending on the needs of your aquarium.
Products such as Seachem Purigen are also popular for helping polish aquarium water and remove dissolved organic waste.
Replacement Filter Media
Many aquarium filters use model-specific replacement sponges, filter pads, cartridges and media sets.
Using the correct replacement media helps maintain water flow and ensures your filter continues operating as intended.
Our replacement filter media range includes replacement sponges, pads and filter media for popular aquarium filters.
What Does Aquarium Filter Media Do?
Filter media is the material inside your aquarium filter that actually performs much of the filtration.
The filter moves aquarium water through the media, allowing different stages to remove debris, support beneficial bacteria or remove unwanted dissolved substances.
A well-designed filtration setup usually combines more than one type of media.
- Mechanical filtration removes visible particles and debris.
- Biological filtration supports the bacteria responsible for processing ammonia and nitrite.
- Chemical filtration can remove selected dissolved impurities when required.
What Order Should Filter Media Go In?
The exact order depends on your aquarium filter, but a common setup is:
- Coarse mechanical media to trap larger waste.
- Fine mechanical media to capture smaller particles.
- Biological media to support beneficial bacteria.
- Chemical media where required for specific water-quality needs.
Always consider the direction of water flow through your filter. The aim is to prevent large amounts of debris from reaching and clogging your biological media.
Choosing the Right Filter Media
The best filter media depends on your aquarium, livestock and filtration system.
For most freshwater aquariums, a combination of mechanical and biological filtration provides the foundation of a good filtration system.
Chemical media can then be added when you have a specific need, such as removing discolouration, odours or certain dissolved compounds.
When choosing filter media, consider:
- The size of your aquarium
- The type and number of fish
- Your filter type
- Available space inside the filter
- Water flow
- Whether you need mechanical, biological or chemical filtration
How Often Should Aquarium Filter Media Be Cleaned?
Different filter media requires different maintenance.
Mechanical media such as sponge can become clogged with waste and may need regular cleaning. Fine filter wool or floss is normally replaced once it becomes heavily soiled or begins to restrict water flow.
Biological media should be treated more carefully. Avoid aggressively cleaning or replacing all biological media at the same time, as this can reduce the population of beneficial bacteria in your filter.
If biological media needs cleaning, gently rinsing it in removed aquarium water is generally preferable to heavily washing it under untreated tap water.
Do I Need Chemical Filter Media All the Time?
Not necessarily.
Mechanical and biological filtration form the foundation of most aquarium filtration systems.
Chemical media is often used when there is a specific reason for it, such as removing discolouration, dissolved organic waste, odours or selected unwanted compounds.
Some aquarium keepers choose to run activated carbon or other chemical media continuously, while others use it only when required.
Frequently Asked Questions
What are the three types of aquarium filter media?
The three main types are mechanical, biological and chemical filter media.
Mechanical media traps physical debris, biological media supports beneficial bacteria, and chemical media removes selected dissolved impurities.
What order should aquarium filter media go in?
A common setup starts with coarse mechanical media, followed by finer mechanical filtration, biological media and then chemical media where required.
The ideal arrangement may vary depending on the design and water-flow direction of your aquarium filter.
How often should aquarium filter media be replaced?
It depends on the media.
Fine filter wool and some chemical media need regular replacement. Biological media is generally kept for much longer and should not be routinely replaced unless it becomes damaged or the manufacturer recommends replacement.
Should biological filter media be replaced regularly?
No. Biological filter media provides a home for beneficial bacteria and is normally intended for long-term use.
If some biological media needs replacing, avoid replacing all of it at once.
Can I use different types of filter media together?
Yes. In fact, combining different types of filter media is usually the best approach.
Mechanical filtration can remove debris before the water reaches your biological media, while chemical media can be added when you need additional water polishing or targeted filtration.
Shop Aquarium Filter Media Online
Explore our range of aquarium filter media for freshwater and marine tanks, including filter wool, filter floss, replacement sponges, ceramic media, activated carbon, chemical filtration media and replacement filter pads.
Whether you're setting up a new aquarium, upgrading your filtration or replacing worn filter media, Aquaholics Online has filtration options for a wide range of aquarium systems.
Biological Filter Media | Mechanical Filter Media | Chemical Filter Media | Replacement Filter Media
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