Sponge ZOOLOGIA Bio round 12/9 cm – ZOOLOGIA circular biological aquarium sponge 12×9 cm

ZOOLOGIA Bio round sponge (12/9 cm) is a circular aquarium filter sponge designed for biological filtration and mechanical debris capture. The open-cell porous structure provides a stable surface for colonization of nitrifying bacteria while mechanically trapping suspended particles and detritus. The sponge is compatible with freshwater aquaria and many marine setups and is intended for use in internal filters, sponge filters, canisters with sponge inserts, and custom DIY filtration arrangements.

Advantages

The sponge combines biological and mechanical filtration in a single medium: its porosity supports beneficial bacterial communities responsible for ammonia and nitrite conversion, while the matrix captures uneaten food, waste and fine particulate matter. Its circular shape and uniform thickness make it easy to fit into round housings and sponge filter holders. The material is washable and reusable, maintaining performance after gentle cleaning. The product is chemically inert, does not release harmful substances into aquarium water, and preserves stable flow characteristics when correctly installed.

Suitable for

• Freshwater aquariums requiring biological filtration and particle removal
• Sponge filters used for fry tanks, shrimp tanks and breeding setups
• Internal filters and canister systems with sponge insert compartments
• DIY filtration projects and custom filter media trays

Key specifications

• Shape: circular
• Diameter: approximately 12 cm
• Thickness: approximately 9 cm
• Function: combined biological and mechanical filtration
• Material: open-cell foam suitable for bacterial colonization
• Compatibility: suitable for freshwater and many marine applications
• Serviceability: washable and reusable with recommended maintenance

How to use

Insert the sponge into the filter housing, sponge filter cup, canister sponge compartment or DIY media tray so that water flows evenly through the foam. For sponge filters, mount the sponge on the lift tube or place it around the airlift area to ensure continuous flow through the media. During initial use, rinse the sponge in dechlorinated water to remove any packing dust before installing. Observe flow direction and ensure the sponge does not block intakes; trim the sponge carefully if a small size adjustment is required.

Usage recommendations

For biological filtration stability, avoid cleaning the entire sponge at once; instead, rinse portions in aquarium water during regular maintenance to preserve beneficial bacteria. Clean the sponge by gently squeezing in a bucket of tank water until excess debris is released. Replace the sponge only when it shows irreversible degradation or when cleaning no longer restores acceptable flow.