This is a great way to add CO2 to your aquarium! You mix citric acid and baking soda on top with a tap and let it sit for a few minutes. I had a working CO2 tank pressure in less than 5 minutes and full pressure in 3-4 hours. I have a 75 gallon tank and judging by my CO2 dripper the diffuser it comes with seems to be enough to get my levels right. It comes with a few extra gaskets and o-rings, a short air line and check valve, a small funnel and extra ceramic discs for the diffuser. THIS DOES NOT SUPPLY CITRIC ACID OR SODA. This is a new setup for me so I'll check if there are any issues, but for now this is the best way to make CO2 as you don't have to pay to fill up the tank! Great bang for the buck. The only thing that's not bad, but keep in mind that the magnet on the valve gets pretty hot when running, the fire doesn't start that hot, but the deff feels pretty warm. I don't think this is a problem and I've seen other reviews mention this as well, nothing to worry about just something to be aware of.
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