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Up inline diffuser required a fairly high amount of pressure to work, so a pressurised co2 cylinder is required.
It produces a very fine mist of tiny co2 bubbles and has very high dissolving rate.
The misting stops a couple of seconds the moment the solenoid if switched off, convenient if couple with timers.
I used to use an inline, but after awhile it got clogged. Also had instances when pressure was too high such that the co2 tube "burst", disattaching itself from the check valve.
I also used an external reactor too. Ista MaxMix L size to be exact.
it also has almost 100% dissolving rate, and does not need as high pressure to work.
You will need a decent flowrate, strong enough to stir up the bubbles and spin the fins in the reactor.
O ring at the bottom has to be capped properly, if not leaks will flood your whole house.
However, if you're using with solenoid, CO2 will be trapped at the top of the reactor even though its been switched off, and will slowly dissolve into the water thereafter.
Both are outside of the tank, so it will be good if you're looking at a minimalist scape.
Both will work well with pressurized co2 and strong flowrate.
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