Oh, i know what in the box ? Bacteria house for wet/dry filter. 

. I ordered these before. I will say they are the best media for wed/dry filter from Japan and the most expensive media too. Good taste. I put these in my filter and i don't need to do water change in 4-6 months and my fish still healthy. Also depend on bio load.


. I ordered these before. I will say they are the best media for wed/dry filter from Japan and the most expensive media too. Good taste. I put these in my filter and i don't need to do water change in 4-6 months and my fish still healthy. Also depend on bio load.


They're best for the Bakki Shower filter, but hope that they will work better in the wet/dry filter than the bio-ball