5 x Compatible with Biorb Marine Service Kit Refills Filter set sets for all tanks

I was unable to use the outer casing from my original biorb marine kit for these, luckily I still had one left from my old cold water system which I was able to open and use, I found it too awkward and will go back to the originals. Having said that once in they do work just as well.

Second Order as a replacement for the rip off Bio product. I use them for a marine bio tube with 4 fish and they keep going.

Worked very well

Excellent alternative to much more expensive kit from BioOrb

Actually more effective and lasts longer than the original Biorb filters