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DIY CO2 reactor.

ForestDave

Member
Joined
12 Nov 2020
Messages
243
Location
Forest of Dean
I previously had been taking @Magoo “Anybody use this Chinese External CO2 reactor” but thought I should start a new post.

I am sure there are much quicker ways to skin a cat but I have at last fitted my DIY CO2 reactor. I set it up yesterday and am really happy with it. It’s pretty much silent apart from a little bit of quiet gurgling in the first 30-60mins. If I put my ear next to it I can hear things going on but you would struggle to notice it much. I managed a 0.9ph drop in 2.5 hrs on a 200L tank and it’s bottomed out there so I’ve just turned the CO2 up a smidge. The tank water is crystal clear without a bubble in sight, (Unfortunately this shows up even more of the of tiny uninvited random snails! 🙄).

The Venturi isn’t working yet. I will shorten the Venturi pipe in the reactor tomorrow and see if that helps. It also has an internal Venturi for any gas which gets trapped around the outside of the cone cylinder. I put a purge valve before the inlet pipe at the top as I reasoned that as the reactor was an inverted cone inside any trapped air would bubble up the pipe. Tbh I used it for a tiny bit of gas yesterday when setting up but it seemed to clear itself although it was louder for the first 30mins or so yesterday.

All in all, it was a bit of fun and kept me entertained. I had to keep fighting the thought, "why on earth didn’t I just adapt a 2ltr coke bottle or some other bottle shape," but once I realized the original flat-topped cylinder design wasn’t working for various reasons (see other thread), it made sense to keep playing around with what I had in front of me.
My tank waters clear though and it’s quiet. Thanks to @Hanuman and @Zeus. for the much-appreciated tips!
 

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ForestDave

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Here’s an idea of the dimensions from earlier images before I laminated some fibreglass sheet on it.
 

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Zeus.

Fertz Calc Meister
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I've had a recent idea to fine tune a CO2 reactor, '3D printing' to get your bespoke parts/fittings made. If it works and you can get the parts made at a reasonable price, the only limit is your imagination, will save all those pipes fittings ,jubilee clips, drilling and gluing. Bespoke top and bottom and clear pipe/tube in middle ;)
 

ForestDave

Member
Thread starter
Joined
12 Nov 2020
Messages
243
Location
Forest of Dean
I've had a recent idea to fine tune a CO2 reactor, '3D printing' to get your bespoke parts/fittings made. If it works and you can get the parts made at a reasonable price, the only limit is your imagination, will save all those pipes fittings ,jubilee clips, drilling and gluing. Bespoke top and bottom and clear pipe/tube in middle ;)
Haha! What would I do with myself!?
No seriously that sounds like a great idea. I have a mate who made a replacement part for his Shimano bike gear lever on a £200 Amazon 3D printer. They’re brilliant machines.
I would say that the condensing cone at the top seems to work a treat though.
 

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