Loaded question. It real on how you have your reactor adjusted and how much you are having to dose. Some last 6 months some 2 years. It just depends on how much you are using.
You can buy empty tanks at harbor freight, full tanks and refills can be done at air gas and many of the soda companies and brewing companies. No need to buy a new one each time. They are certified for quite a few years of refills.
My ocean. 90g (yup, won it!), 40g, 28g, & 10g Systems PADI Advanced Open Water Tank Thread:
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