Filter Foam Cartridge insert for Tetra BF 400/600 Plus (model 9111)

Replacement foam cartridge insert designed for Tetra BF 400/600 Plus internal aquarium filters. This foam sponge provides mechanical filtration by trapping debris, uneaten food and suspended particles, helping to maintain water clarity and contributing to a stable environment when used alongside biological filter media. The cartridge is shaped to fit the internal housing of compatible Tetra filters and is intended for regular maintenance and timely replacement to preserve filter performance.

Advantages

The foam material captures coarse and fine particulate matter without restricting water flow, supporting efficient mechanical filtration. Its porous structure allows water to pass through while retaining solids, which reduces clogging of subsequent filter media and prolongs overall filter life. The cartridge is easy to install and remove for cleaning or replacement, enabling straightforward routine maintenance of the Tetra BF 400/600 Plus filter system.

Suitable for

• Routine replacement in Tetra BF 400/600 Plus internal aquarium filters
• Mechanical filtration to remove visible debris and suspended particles
• Pre-filtration stage before biological media to reduce clogging
• Freshwater community tanks and planted aquaria requiring regular maintenance

Key specifications

• Material: open-cell foam designed for aquarium filtration
• Function: mechanical filtration (particle and debris retention)
• Compatibility: shaped for insertion into compatible internal filter housings
• Service: intended for periodic cleaning or replacement as part of routine maintenance

How to use

Turn off and unplug the filter before opening the housing. Remove the old foam cartridge and inspect the filter compartment for accumulated debris. Rinse the new foam cartridge in aquarium water (not tap water) to remove loose particles and then insert it into the filter housing in the same orientation as the original. Reassemble the filter, restore power, and check that water flow is normal. Replace or rinse the foam cartridge regularly according to tank load and manufacturer guidance to maintain filtration efficiency.

Usage recommendations

Rinse the foam cartridge in taken-from-tank water during routine water changes to preserve beneficial bacteria; replace the cartridge when it shows signs of permanent clogging, tearing, or when flow is noticeably reduced despite cleaning.