Sorry, I've not come across bioball denitrifiers using bio balls around here.
I've seen a Reef Octopus denitrater but is used a sulphur based media I think.
It would be interesting to know how the OP's "all in one" strips the oxygen to allow for the completed process and the final stage only happens when the oxygen is being used up faster than it can be produced creating the anaerobic situation needed, as I understand it.
Also, if his built in denitrifier cylinder was able to strip the nitrates, why would it have a chamber for media to remove nitrates?
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