This is a Used MTC Marine Technical concepts ProCal Calcium Reactor. I believe its rated up to 500 gls. It comes with used Reactor, filled with brand new media and brand new Fzone Co2 regulator. All you need is a Co2 Tank which you can get on Ebay for around $65. I bought this from another member and decided to a different route. I'm looking to get what I paid for it. The price is $250
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