Filter sponge HAPPET fine-pored 25 x 25 x 5 cm for aquarium filtration and biological media

HAPPET fine-pored filter sponge 25 x 25 x 5 cm is a foam pad designed for aquarium filtration that combines mechanical debris removal with biological filtration capacity. The fine-pored structure traps small particles while providing a large surface area for colonisation by nitrifying and other beneficial bacteria. The 25 x 25 x 5 cm size fits many internal and external filter housings as well as custom DIY filter boxes and media compartments, and is suitable for both freshwater and marine aquaria where a fine foam pad is needed.

Advantages

The fine-pored foam captures suspended particles and reduces mechanical load on downstream filter media, extending the service life of other cartridges and chemical media. Its open-cell structure supports stable bacterial colonies for biological filtration and contributes to ammonia and nitrite conversion. The pad is easy to cut to shape for different filter housings, lightweight, and washable for repeated use, helping to maintain consistent water clarity and quality when rinsed correctly.

Suitable for

• Internal and external aquarium filter inserts and trays
• DIY sump and filter box media layers
• Freshwater community tanks and planted aquaria requiring fine mechanical filtration
• Marine and reef systems where gentle mechanical filtration is needed

Key specifications

• Material: fine-pored open-cell foam suitable for biological colonisation
• Dimensions: approximately 25 x 25 x 5 cm
• Pore structure: fine pores designed to trap small particles
• Compatibility: adaptable to most filter housings and custom media compartments
• Maintenance: washable and reusable with proper rinsing

How to use

Select a location in the filter flow path where the sponge will intercept suspended solids without blocking water flow excessively. Trim the sponge to the required shape and fit it into the media tray, filter cartridge slot, or DIY compartment. Place the pad upstream of chemical media to protect them from clogging and downstream of coarse mechanical media when staged filtration is used. Rinse the sponge gently in dechlorinated or tank water during maintenance to remove trapped debris while preserving beneficial bacteria; replace only when structural breakdown or irreversible clogging occurs.

Usage recommendations

For optimal biological performance, perform maintenance using aquarium water and avoid aggressive squeezing or cleaning with tap water that contains chlorine. Inspect the pad every 2–4 weeks for clogging in heavily stocked or heavily fed systems, and stage with coarse foam ahead of the fine-pored sponge in high-debris setups to extend intervals between cleanings.