Ya I was going to suggest the pellets also. Never used them but is nitrates not what they are good at.
I think an ATS for that system would be to large and messy for them. My large one did the job on my 225 but thats about it. A remote plenum sandbed also works well for nitrates and is fairly cheap. Being remote is dose not collect as much crap and is easily accessed for cleaning.
I also have friends back in Manitoba who run nitrate reactors still and have success with them.
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Doug
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