15 pcs reinforced filter media for gex slim filter

Reinforced filter media compatible with all sizes of the Slim Filter.

15 cavities fit into the space on the right end of the Slim Filter.
Simply place them there to help stabilize water quality.
Fits in the red-framed area in the second image.

After about a month of actual use, it has stabilized, so we are now starting sales.
I personally like it because there is no decrease in water volume.
Genuine filter media is expensive, so I hope this will help extend the replacement frequency even a little.

Please ask any questions you may have.