I am selling (I guess it is sold already) a used ozonizer for $60.
You can buy new ones (cheapy, but will work for a year or two) for around $100.
I have helped a couple of real newbies set up simple 55 gallon systems, and I got them a $159 CAD ozonizer right off the bat, it works great (they just use it on a very low setting, until they ever get an ORP monitor). They never run carbon (I didn't for 3+ years) and just let the little bit of ozone do its thing.
Just MO, but I think it is cheaper then buying carbon and other stuff long term.
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