Filter Foam Insert Exo Terra Bio-Foam for AC70 aquarium filter – replacement sponge insert

Exo Terra Bio-Foam is a replacement sponge insert designed for the AC70 aquarium filter. The foam restores mechanical and biological filtration by trapping suspended debris and providing a porous surface for beneficial bacteria. Intended as a direct spare part for routine maintenance, this bio-foam helps maintain water clarity and supports the biological balance in small to medium aquaria without altering existing filter setup.

Advantages

The replacement foam offers consistent mechanical filtration by capturing fine particles and preventing clogging of downstream media. Its open-cell structure increases surface area for nitrifying bacteria, supporting biological filtration and faster establishment of microbial colonies after cleaning or part replacement. The sponge is washable and reusable for multiple maintenance cycles, which reduces the frequency of full media replacement while maintaining filter efficiency.

Suitable for

• Routine maintenance of AC70 aquarium filter units
• Small to medium freshwater and planted aquaria
• Situations requiring restoration of filter flow and mechanical filtration
• Replacement of worn or collapsed sponge inserts

Key specifications

• Material: open-cell foam designed for aquarium filtration
• Function: mechanical and biological filtration support
• Form factor: sponge insert sized for AC70 filter housings
• Durability: washable and reusable for multiple maintenance cycles
• Compatibility: designed to fit AC70 external/power filter models

How to use

Turn off and disconnect the AC70 filter from power before opening the unit. Remove the old sponge insert and inspect the filter housing for debris. Rinse the new bio-foam briefly in dechlorinated water to remove loose particles, then place it in the designated slot inside the filter. Reassemble the filter, restore power, and verify normal flow. If replacing a heavily colonized sponge, monitor water parameters for a short period as biological activity re-establishes.

Usage recommendations

Perform visual checks of the sponge every 4–6 weeks and perform gentle rinsing in tank water when clogged. Replace the bio-foam as part of regular maintenance or when physical degradation is visible. Avoid using tap water with chlorine for rinsing; use dechlorinated or aquarium water to preserve beneficial bacteria.