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Hey DGC!  I run 2 tents, veg and flower,  but only run a co2 setup in flower room.   At one point I tried out the TNB Naturals co2 canisters but found them too pricey for the 1-2 weeks they last.   I have been running the same TNB naturals canister for the last year for c02 by refilling it once a week with table sugar,  a couple tablespoons of honey (optional), and some cheap standard bread yeast from the grocery store.   I use about a teaspoon of the yeast.  Add about a liter of warm water to the sugar and yeast and shake daily.   This will last 1-2 weeks pumping out co2 and is much cheaper than buying the bottles ever time.