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DIY inline CO2 diffuser

Joined
14 May 2009
Messages
316
Here are the plans for the inline CO2 diffuser I recently built

1_DIY_CO2.jpg


1_DIY_CO2_2.jpg


In practise the design seems fairly effective, and is more efficient at dissolving and distributing CO2 than other diffusers I have used.
The design does not differ greatly from some of the DIY diffusers I have seen. However, it is simple to construct with no drilling, sawing or gluing required, and it improves contact time between water and bubble by spinning the water inside the reaction chamber. The spinning effect is produced by inserting an Eheim lock nut into the hose (as shown in the diagram). After an about an hour of running, the internal screw thread of the lock nut will create a small vortex , not the raging vortex of terror I had hoped for, but it does increase contact time.
For my 20 litre tank a reaction chamber length of 25cm is sufficient, for larger systems simply increase the length.
I hope this is useful

Regards James
 

zig

Member
Joined
4 Jul 2007
Messages
686
Location
Dublin Ireland
Very good idea mate, so simple, the addition of the locking nut is basically giving you a quasi mazzei effect, I'd say you could improve upon it by using step down reducers either side of the Reducing T Piece, a simple idea would be to use hose pipe of gradually reducing smaller sizes pushed inside the 19mm eheim hose you are already using that should create the vortex more effectively (I think), it would reduce your flow obviously but maybe not that much, your idea is so simple you could play around with it very easily. I will give you 9 out of 10 :lol: :D overall simple effective idea.
 

James Marshall

Member
Thread starter
Joined
14 May 2009
Messages
316
Thanks Peter

I see what you mean about the step downs i may give that a try.
I think that the pitch and depth of the thread in the lock nut are too small for ideal effectiveness.
At conception, I wanted to use the top section of an Eheim surface skimmer ( as this creates a very effective vortex, to keep suction constant within the skimmer unit), but at 35mm diameter I could not find hose and fittings to match.
I'm currently looking at impellor covers, as some of these have angled fins internaly, which may improve things.

Cheers James
 

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