Aquarium Bio Filter Sponge 100x10x3cm – Biochemical Cotton

Aquarium Biochemical Filter Sponge – Thick Bio Cotton Foam for Cleaner, Healthier Water

Give your fish the clean, oxygen-rich environment they deserve with this Thick Biochemical Filter Sponge. Measuring 100cm × 10cm × 3cm, this generous-sized bio cotton foam is perfect for use in freshwater and marine fish tanks, sumps, canister filters, and DIY filtration setups. It promotes powerful biological filtration by hosting beneficial nitrifying bacteria that break down harmful ammonia and nitrites — naturally stabilizing your water quality.

Made in Mainland China.

Why Choose This Bio Filter Sponge?

• 🐟 Biological Filtration: Porous sponge structure provides maximum surface area for beneficial bacteria colonies, helping cycle and stabilize your tank.
• 💧 Improves Water Quality: Traps debris and fine particles while increasing oxygen solubility for healthier fish and aquatic life.
• 🔇 Silent Operation: Works quietly without disturbing your fish or your home environment.
• ✅ Easy to Clean & Reusable: Simply rinse with aquarium-temperature water and reuse — no need to replace frequently.
• ✂️ Versatile & Cuttable: Easily trimmed to fit any filter, sump, or custom aquarium setup.
• 🌿 Safe for All Fish: Made from high-quality, fish-safe sponge material — free from harmful chemicals.

Product Specifications

How to Use

1. Soak before use: Submerge the sponge in aquarium water for at least 5 minutes before placing it in your filter. This helps nitrifying bacteria colonize the sponge more quickly.
2. Rinse correctly: Always rinse the sponge using aquarium water at room temperature — never use hot tap water, as this will kill beneficial bacteria.
3. Cut to size: Trim with scissors to perfectly fit your specific filter or sump compartment.
4. Allow to expand: The sponge is compressed for shipping. Simply leave it in open air for a few minutes after unboxing and it will return to its full shape and size.

Perfect For

• Freshwater & saltwater aquariums
• Canister filters, hang-on-back filters & sumps
• DIY filter builds
• Breeding tanks & fry tanks (gentle filtration)
• Pond pre-filter setups

Learn More About Healthy Aquariums

Understanding the nitrogen cycle is key to keeping your fish healthy. Learn more at NCBI: Water Quality in Aquatic Environments.

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Important Notes

• Product images are for reference only; please refer to the written dimensions for accurate sizing.
• Slight color variation may occur due to differences in monitor settings.
• Minor measurement differences (±1–2cm) may occur due to manual measuring.

Frequently Asked Questions

Q: What size is this aquarium filter sponge?

A: This biochemical filter sponge measures 100cm long × 10cm wide × 3cm thick (approximately 39" × 4" × 1.2"). It can be easily cut to fit any filter, sump, or aquarium setup.

Q: Is this sponge safe for fish and other aquatic life?

A: Yes! This bio cotton sponge is made from fish-safe, chemical-free materials and is suitable for freshwater and marine aquariums, including tanks with sensitive fish, shrimp, and invertebrates.

Q: How do I clean the aquarium filter sponge?

A: Rinse the sponge gently using room-temperature aquarium water — never use hot water or tap water, as chlorine and heat will destroy the beneficial bacteria colonies living in the sponge. Squeeze out debris and return it to your filter.

Q: The sponge arrived compressed — is this normal?

A: Absolutely. To reduce shipping volume, the sponge is compressed before packaging. Simply remove it from the packaging and place it in open air for a few minutes — it will fully expand back to its original 100×10×3cm size.

Q: Can this sponge be used in a pond or outdoor water feature?

A: Yes, this versatile bio filter sponge can be used in pond pre-filters, outdoor water features, and any setup where mechanical and biological filtration is needed.