GEX Carbon Filter Cartridge – 3 Piece Pack (For Slim HOB Filter)
The replacement media for the GEX Slim filter, suitable for GEX filter S / M / L models and Rakufil inter filter.
Compatible with sea water, fresh water, and planted tanks.
The left replacement media is activated carbon replacement cotton. The right replacement media is bacteria cotton.
| Size | 3 pieces inside |
|---|
FAQ
Is this filter compatible with all GEX Slim filter models?
Yes, it is suitable for GEX filter S, M, and L models.
Can this cartridge be used in a planted tank?
Yes, it is compatible with planted tanks.
What types of media does this cartridge contain?
It includes activated carbon replacement cotton on the left and bacteria cotton on the right.

Frank Lyman –
Works well in my freshwater tank. The carbon media helps reduce odors and improves water clarity. Easy to install and fits perfectly with my Slim HOB filter. No leaks after installation.
Julian Hodges –
Good replacement for the original filter media. The bacteria cotton helps maintain healthy bacteria levels. Works well in both freshwater and planted tanks. Slightly harder to remove than the original, but still manageable.
Max Butler –
Used in a marine tank with good results. The activated carbon helps filter out impurities and improves water quality. The pack includes three pieces, which is perfect for regular filter maintenance.