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What Should You Put in Your Canister Filter? (SunSun, Eheim & Fluval Guide)
A canister filter is one of the best ways to keep your aquarium water clean, clear, and stable. But while the filter body provides water flow, the real performance depends on the filter media you put inside. Choosing the right combination of mechanical, biological, and chemical media ensures your fish and plants thrive.
At Aqua Club Online, we stock top brands like SunSun, Eheim, and Fluval, along with a wide selection of filter media to help you build the perfect filtration system.
The 3 Types of Filtration in a Canister Filter
1. Mechanical Filtration
This is your first line of defense — it physically traps debris, uneaten food, and particles.
- Best Media: Filter pads, foams, and sponges.
- Recommended Products:
- Nano Roll Mixed Color – Single Piece – ideal for catching fine particles.
- SunSun Filter Pad Set – designed for HW series canisters.
2. Biological Filtration
This is where beneficial bacteria grow to convert toxic ammonia and nitrite into less harmful nitrate. A must for any healthy tank.
- Best Media: Ceramic rings, porous stones, and high-surface bio media.
- Recommended Products:
- Biohome Sump Brick – Filter Media – excellent biological media for heavy bio-load tanks.
- Ceramic Rings Filter Media – 1000 g – classic and affordable option for SunSun, Eheim, or Fluval filters.
3. Chemical Filtration
This step removes dissolved impurities, odors, discoloration, and toxins, giving your water that polished, crystal-clear look.
- Best Media: Activated carbon, phosphate removers, resins.
- Recommended Products:
- Filter Media – Activated Carbon (1 kg) – effective at removing odors and toxins.
- Eheim Activated Carbon – quality carbon designed for long-lasting performance.
How to Layer Media in Your Canister Filter
No matter if you own a SunSun, Eheim, or Fluval, the basic setup is the same:
- Bottom Layer (where water enters): Coarse sponge or Nano Roll mechanical filter → traps large debris.
- Middle Layer: Ceramic Rings or Biohome Sump Brick → supports bacterial colonies for biological balance.
- Top Layer (water exits): Activated Carbon → removes toxins and polishes water.
Recommended Setups by Brand
- SunSun HW Series: Sponge → Ceramic rings → Bio balls → Activated carbon.
- Eheim Classic: Filter pad → Biohome Sump Brick → Activated carbon.
- Fluval FX Series: Foam pads → Ceramic Rings → Fluval Carbon.
👉 Shop all Canister Filter Media
Pro Tips for Canister Filter Media
- Rinse media in tank water only, never under tap water (chlorine kills beneficial bacteria).
- Replace activated carbon every 3–4 weeks for maximum effectiveness.
- Biological media like ceramic rings or Biohome can last for years — just rinse gently.
- Arrange media in proper flow order: mechanical → biological → chemical.
By setting up your canister filter correctly and using the right SunSun, Eheim, or Fluval media, you’ll achieve crystal-clear water and a balanced, thriving aquarium.
