DIY co2 diffusion - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 11-20-2011, 06:23 PM Thread Starter
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DIY co2 diffusion

Im changing my co2 diffusion method from an in effective bubble ladder to running the tubing direct into a power head/internal filter and I was wandering what would be better , just to run the co2 tube into the int filter and the impeller would break the bubbles up or shall I use an air stone to give off small bubbles which would then break up smaller through the impeller ?? Would it make much of a difference?? Also I'm thinking of connecting the int filter to the same timer as the light so the co2 only gets diffused around the tank when needed to along with when the lights are on, so when it's off it will not diffuse very well being in the corner of the tank Where the int filter will be , will this be ok ?? Will it disturb anything having different currents in the water At different times?
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post #2 of 8 (permalink) Old 11-20-2011, 06:28 PM
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This is what I do. I use an elite mini as a diffuser, works great.

I dont use an airstone, just run the line under the impeller, and presto.

In light of using a time on my power head, I use a time to and air pump plumbed into the co2 line with a splitter and check valve. As the lights go out my air pump powers on. The co2 and air mix and just bubble straight out the top of the tank, works like a charm for me.


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post #3 of 8 (permalink) Old 11-21-2011, 09:37 AM Thread Starter
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Where abouts do you keep your filter for diffusing ??
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post #4 of 8 (permalink) Old 11-22-2011, 03:42 AM
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I would at least recommend sticking a chopstick in the co2 output before it goes it gets chopped up by the impeller, it helps with the sound and allows for a constant supply of tiny bubbles. An airstone works fine too, but I actually found that chopsticks do a better job at making miniscule bubbles.

Good idea with the timing, that's what I do with my elite mini and it works great.
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post #5 of 8 (permalink) Old 11-22-2011, 04:57 AM
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Another option is to bubble the CO2 into a soda bottle and have the powerhead output connected to the bottle. This gives very good results, but you have to like the look (or have a place to hide it).

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post #6 of 8 (permalink) Old 11-22-2011, 06:40 AM
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Quote:
Originally Posted by samjpikey View Post
Im changing my co2 diffusion method from an in effective bubble ladder to running the tubing direct into a power head/internal filter and I was wandering what would be better
Read on.

https://www.plantedtank.net/forums/di...ml#post1582396
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post #7 of 8 (permalink) Old 11-22-2011, 03:52 PM
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What I use for diffusion on several tanks is the Hagen Elite Mini. Instead of the airstone and tube it comes with, simply run the output from your co2 into the outlet of the Elite.

I place the Elite under the outflow of the HOB so that the bubbles are first broken up by the force of the Elite, but then slammed by the water coming out the HOB.

The co2 doesn't need to hit an impeller at all.

The Elite's sell for $7 on Amazon: http://www.amazon.com/Hagen-Elite-Un.../dp/B0009YD7D4

I use two in a 36g with three diy bottles (2 are run through one Elite and 1 on the other.) I just place them under one of the two HOB filters near the bottom of the tank and the majority of bubbles never hit the surface.
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post #8 of 8 (permalink) Old 11-22-2011, 07:26 PM Thread Starter
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well this is what i have done, i use 2 x 2litre bottles and i have ran the tube direct into the back of the filter as you can see (the filter is a 10w pond filter which is set to under just half flow, i got given this from a friend , if i can get something for free i will) , i haven`t used an airstone on the end or anything , ive kept the filter sponge in the bottom housing to prevent the impeller from sucking up crap. This isnt noisy one bit and i get tiny bubbles diffused around the tank constantly with good flow, i just hope i get good results
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