Sponge ZOOLOGIA Bio Square 15 x 7 cm – aquarium filtration sponge

ZOOLOGIA Bio Square sponge 15 x 7 cm is a rectangular aquarium filtration foam designed to provide both mechanical and biological filtration. The 15 x 7 cm size fits a variety of internal and external filter chambers and sponge filter housings, capturing suspended debris while offering a porous surface for beneficial nitrifying bacteria to colonize. The open-cell foam structure promotes water flow and gas exchange, contributing to improved water clarity and biological stability in freshwater and adequately filtered planted aquaria.

Advantages

The Bio Square sponge combines mechanical debris removal with a large surface area for bacterial growth, reducing organic load and supporting the nitrogen cycle. Its rectangular shape and standard dimensions allow easy cutting or stacking to match different filter housings. The foam is durable and resilient under typical aquarium flow conditions and can be rinsed and reused multiple times without significant degradation when maintained properly.

Suitable for

• Internal filter chambers in small to medium aquaria
• Sponge filters for biological filtration and gentle flow
• External canister pre-filters or media compartments
• Replacement or upgrade of existing mechanical/biological media

Key specifications

• Shape: Rectangular foam block
• Dimensions: 15 x 7 cm
• Material: Open-cell filtration foam suitable for bacterial colonization
• Filtration function: Mechanical trapping of particles and biological surface for nitrifying bacteria
• Compatible environments: Freshwater aquaria and planted tanks with standard filtration setups

How to use

Rinse the sponge under aquarium water or dechlorinated water before first use to remove loose particles. Insert the Bio Square into the intended filter compartment, sponge filter housing, or pre-filter slot, ensuring water flows through the material for effective trapping and bacterial colonization. If necessary, trim the foam with scissors to fit non-standard compartments or to increase flow by creating additional channels. Do not use detergents or hot water, as these can damage the foam and remove beneficial bacteria.

Usage recommendations

Perform routine maintenance by gently rinsing the sponge in removed aquarium water during water changes to preserve beneficial bacteria while removing trapped debris. Replace the sponge only when it shows signs of permanent compression, tearing, or irreparable biofilm saturation; otherwise periodic cleaning will maintain performance. Avoid sterilizing methods that eliminate beneficial bacteria.