DIY CO2 reactor - The Planted Tank Forum
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post #1 of 6 (permalink) Old 01-23-2018, 05:38 AM Thread Starter
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DIY CO2 reactor

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.
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post #2 of 6 (permalink) Old 01-25-2018, 05:09 AM Thread Starter
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Unit assembled and sealed (siliconed the threads on the center bolt). attached check valves to the fert and co2 intakes
so not to spill water during test. Checked fit but not yet plumbed, will test for water tightness tomorrow after silicone cures. I'm concerned whether there will be a serious impact on flow with all those kinks in tubes, I guess will find out soon. worst case will consider upgrading to 406 if my 306 struggles to much.

the 20lb CO2 tank I acquired does not fit the cabinet, but it was cheaper then refill. will need to figure something out for bit more presentable view. or maybe will try to have some sort of stand to keep it inside but leaning

Last edited by agrasyuk; 01-25-2018 at 05:19 AM. Reason: .
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post #3 of 6 (permalink) Old 02-01-2018, 07:55 PM
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have you run it yet?
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post #4 of 6 (permalink) Old 02-01-2018, 11:09 PM
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What type of metal is the cylinder made of ???

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Growing is not that difficult.
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post #5 of 6 (permalink) Old 02-02-2018, 12:30 AM
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Quick and easy, down and dirty solution to hide the tank? One that suits me as well as my wife is a simple box over the CO2 tank, covered with a simple sheet of fabric. That way you get the tank hidden and she gets a plant stand! How sturdy to make the box depends on the plant size and weight but it could also serve to hold a lightweight picture?
When you need to get to the tank, set the cover back to the side.
My "plant stand" also serves to hide the PVC drain I ran out the dining room wall!

Last edited by PlantedRich; 02-02-2018 at 12:31 AM. Reason: correction
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post #6 of 6 (permalink) Old 02-02-2018, 06:08 PM Thread Starter
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Its been running a bit over a week now. mounted the cylinder slightly tilted so the bubbles go right into the incoming stream instead of potentially accumulating on a side. i can hear a lot more bubbling this way.

center bolt is stainless. cylinder made of aluminum, but the bare metal is not exposed - it is coated with something glasslike, inside and outside. it's medical grade construction, pretty sure its safe for fish.

thinking about it I left the 20lb cylinder for the downstairs tank and switched to the paintball setup regulator came with. now its all looking "purdy". will get a 5-10lb cylinder when that runs out. still need to shorten the co2 line. yet to start on the doser, bloody cold in the garage

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