pressurized co2 cylinder and regulator system will provide much longer and steady CO2 injection, you can build a industrial grade co2 system yourself...
I came from the freshwater background and CO2 systems discussion was really deep because not many other complicated equipment involved for freshwater planted tank.
this is my personal co2 system that I built in 2013, I believe it will serve for generations, it is 316L stainless steel regulator.
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