aside of aquariums my other hobby is accumulating junk it seems. When something like medical oxygen generator in unknown condition comes across i will happily pick it up. pulled the nice quiet compressor for laser air assist and for few years was thinking where to use the cool looking nitrogen scrubber tubes. now the time has come
Cylinder comes with two o-ring sealed caps which are held by through bolt. inlet fitting on one side, airline barb T connector on the other.
Split the thing open, carefully drained the fine granules of nitrogen scrubber media (perhaps will come to use?), Drilled and tapped both caps for 5/8 Barb fitting (those NPT), drilled and tapped the side to house another airline barb.
the existing inflow fitting is almost as if it was made to house submersible temperature sensor. very tight fit, probably waterproof as it is, will be reinforcing with pure silicone however.
CO2 will get injected through the single barb angle fitting. the split T I plan to use for metered micro and macro fertilizer solution plumbed from auto dozing device.
this has quite an industrial look to it, but unfortunately not transparent. to help with mixing I plan on using the plastic stops that were originally used to pack the scrubber media tightly. i'm guessing water going through lots of small holes (and few bigger ones i drilled just in casae) should mix things up quite well in there, just how much they restrict the flow will have to be seen, my guess is not to much as total area is at least somewhat comparable to 5/8 inlet and outlet.
if I didn't already have inline heater for that tank i would have strongly considered mounting the heater inside the chamber as well.