Aquarium Biochemical Filter Sponge Foam, Black Fish Tank Filter Cotton, Cut-to-Size Bio Sponge for Freshwater & Marine Tanks, 15–50 PPI
🐠 Maintain a cleaner and better-filtered aquarium with this thick biochemical filter sponge. Designed for compatible aquarium, fish tank, and pond filtration systems, this black foam sponge helps trap residues and provides a porous surface for beneficial nitrifying bacteria to grow. Its multi-porous structure offers excellent water permeability while providing a large surface area for biological filtration, making it a practical choice for routine aquarium maintenance.
💧 Flexible, reusable, and easy to customize, the sponge can be cut to the size and shape needed for compatible filter systems. It is suitable for both freshwater and marine water applications and can be cleaned and reused. Available in 15 PPI, 25 PPI, 35 PPI, and 50 PPI options, you can select the density according to your filtration requirements. The sponge is supplied vacuum-compressed for shipping and expands back toward its original form after being laid flat for approximately 1–2 days.
🐠 Biochemical Filtration — Provides a porous surface that supports the growth of beneficial nitrifying bacteria for biological filtration.
💧 Excellent Water Permeability — Multi-porous foam allows water to pass through efficiently while helping capture aquarium residues.
📏 Cut-to-Size Design — Easily cut and shaped to fit compatible aquarium filter systems and different setups.
⚫ Thick Black Foam — Durable biochemical cotton foam provides practical filter media for everyday aquarium maintenance.
🌊 Freshwater & Marine Use — Suitable for compatible filtration setups in both freshwater and marine aquariums.
♻️ Reusable Filter Media — Can be cleaned and used again for ongoing aquarium filtration.
🔢 Multiple PPI Densities — Available in 15, 25, 35, and 50 PPI options for different filtration requirements.
🧫 Large Bacteria Surface Area — The porous structure provides space for beneficial bacteria to establish for biological filtration.
PPI means Pixels Per Inch in general usage, but for this filter sponge, PPI refers to the approximate number of pores per inch and indicates the foam's pore density.
15 PPI: More open structure and greater water flow.
25 PPI: Medium-open filtration structure.
35 PPI: Finer foam structure for increased particle trapping.
50 PPI: Densest option listed, providing finer mechanical filtration.
Simple guide: Lower PPI = more open foam and easier water flow. Higher PPI = denser foam and finer filtration.
Product Type: Aquarium Filter Sponge / Biochemical Cotton Foam
Colour: Black
Material Type: Biochemical Cotton Foam
PPI Options: 15 PPI, 25 PPI, 35 PPI, 50 PPI
Available Sizes: 100 × 25 × 5cm, 50 × 50 × 5cm, 50 × 25 × 2cm
Feature: Thick, Multi-Porous, Reusable
Application: Compatible Aquarium, Fish Tank & Pond Filtration Systems
Water Type: Freshwater and Marine Water
High-concerned Chemical: None
Origin: Mainland China
Quantity: 1 Piece
Colour: Black
🐟 Suitable for:
Freshwater aquariums
Marine aquariums
Fish tanks
Ponds
Compatible aquarium filter systems
Filter media replacement
Additional filter media
Custom aquarium filtration setups
Biological filtration
Routine aquarium maintenance
📏 Select the PPI and size that best suit your compatible filtration system.
✂️ Cut the sponge to the required shape and dimensions if necessary.
💧 Place it securely inside the compatible filter unit.
🧫 Allow the porous sponge to provide a surface for beneficial nitrifying bacteria.
🧼 Clean the sponge when necessary so water can continue flowing through the pores.
♻️ Reuse the sponge after cleaning when it remains in suitable condition.
📅 The supplied product information advises replacing the bio-sponge approximately every three months to help maintain filtration performance and support bacterial growth.
📦 The sponge is vacuum-compressed for packaging and shipping.
When you receive the product:
Remove the sponge from its packaging.
Lay it flat in a suitable place.
Allow approximately 1–2 days for the sponge to restore toward its original size and thickness.
Once restored, it can be prepared for use in a compatible filtration system.
Vacuum compression does not affect the filtration performance of the biochemical cotton once it has returned toward its original form.
The sponge can be manually cut to suit compatible filter systems.
Manual cutting may result in a 0–2cm size difference.
Please check the required dimensions before cutting.
The product is supplied in black.
PPI options indicate different foam pore densities; choose according to your desired balance between water flow and filtration.
Each package contains 1 piece of filter biochemical cotton.
The product is intended for use in compatible aquarium filtration systems.
Each order includes:
1 × Black Aquarium Biochemical Filter Sponge
The sponge is vacuum-compressed during packaging to reduce its shipping volume. Allow approximately 1–2 days after unpacking for it to restore toward its original form.
We are committed to providing a positive shopping experience. If you have questions about selecting the appropriate PPI, size, or compatibility with your filter system, please contact us through the available customer support channel.