larch's DIY CO2 Setup for 80 Litre Tank

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larch created the topic: larch's DIY CO2 Setup for 80 Litre Tank

So I decided to go the DIY CO2 route for my tank as it is a low maintenance cheap on the fly DIY setup and so far after some trail and error I think I finally got it down. What you will need is the following:

1. 2 litre Coke bottle label removed and washed and left out to dry.

2. 1 litre Coke bottle label removed and washed and left out to dry.

3. Airline tubing +- 6 meters depending on your needs and non-return valve.

4. Air-stone and two suction cups and some marine silicon.

And instead of drilling holes and hap haphazardly using silicon to keep it in place, I am using taper ended screw in connectors from a sprinkler system. I made tiny holes in the bottle caps and then screwed these into the cap and used some contact glue after screwing them in and that is it. And since my CO2 indicator is telling me that my 2 litre bottle is producing too much CO2 I will be switching to 1.5 litre bottles:

This is my final build of my DIY system, I don't think I can improve it any more than I have now. But like they say in DIY there is always room for improvement. So my next build instead of using a 2 litre bottle is using a 1.5 litre and instead of directly glueing the air tubing into the hole in the cap I used barbs and bars with tapped screws (The type they use in irrigation systems) which I bought ad Builders Warehouse and screwed them into the cap and clued them with a bit of contact glue just to be sure.

I then I took some pieces of wood I had left and cut a small platform and then cut two square holes in the platform and then two smaller pieces I nailed onto the bottom for feet. The bottles fit in snugly, I sanded it down and added a few coats of varnish too it. I then bought a 2 valve switch which I attached too my little stand using those nail clips you usually use to attach your telephone wiring too wooden skirting and this is the end result:


So after waiting for my old DIY setup to run out of steam I finally setup the new one today:
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OFL replied the topic: larch's DIY CO2 Setup for 80 Litre Tank

Having never kept a planted tank I had never only had the need for any type of C02. However, I'm sure this thread will be very helpful to people who are wanting to go down that route to accept my thanks for posting this article.

I may not always be right, but I am always the BOSS :-)
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tehmole replied the topic: larch's DIY CO2 Setup for 80 Litre Tank

i like how you rigged that up .. do remember to put a stopper between the two bottles, so the water wouldn't go back to bottle#1. for the CO2 to the tank, i would stick the tub into a powerhead, it'll chop up the bubbles finer and pushes it through out the tank... i found that with an air stone, the bubbles are too big. but it sure looks like a nice rig.
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jnet replied the topic: larch's DIY CO2 Setup for 80 Litre Tank

looks pretty simple and easy to follow :)

I think urua joey does similar one

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larch replied the topic: larch's DIY CO2 Setup for 80 Litre Tank

tehmole wrote: i like how you rigged that up .. do remember to put a stopper between the two bottles, so the water wouldn't go back to bottle#1. for the CO2 to the tank, i would stick the tub into a powerhead, it'll chop up the bubbles finer and pushes it through out the tank... i found that with an air stone, the bubbles are too big. but it sure looks like a nice rig.


It runs into and airstone that is located inside a powerhead that chops up the bubbles and spits them out into the tank. You can see the powerhead on the right hand side of the picture really small about the size of a large match box:
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larch replied the topic: larch's DIY CO2 Setup for 80 Litre Tank

jnet wrote: looks pretty simple and easy to follow :)

I think urua joey does similar one


Yeah used urua joey's as an example and added some of my own touches.
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tehmole replied the topic: larch's DIY CO2 Setup for 80 Litre Tank

hey larch, what's your mixture like? amount of yeast to sugar?
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larch replied the topic: larch's DIY CO2 Setup for 80 Litre Tank

tehmole wrote: hey larch, what's your mixture like? amount of yeast to sugar?


2 cups sugar.
1 tsp baking soda. (Reason for baking soda is it stops the water from going acidic which kills the yeast)
1 tsp yeast

Start with a small bowl and add a small amount of lukewarm water (Not hot as it will kill the yeast) and add a teaspoon or two of sugar. Mix in the yeast with a fork, stirring regularly until bubbles form on the surface. This will help to "activate" dry yeast by adding oxygen, preventing mass die-offs that occur if you just throw the yeast into the bottle. Let this sit for 10 minutes.

Now add the 2 cups of sugar and a table spoon of baking soda into the 2 litre using a funnel. Fill it about 2/3 of the way with lukewarm water. Tap water is fine, put on a cap and shake till all of the sugar and baking soda has dissolved. Then add the bowl of yeast you don't have to mix it just put on the caps and make sure they are secured properly and store them near your tank.
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tehmole replied the topic: larch's DIY CO2 Setup for 80 Litre Tank

i haven't use baking soda .. i'll try that next time...

how long does your mixture last? mines in a single OJ bottle ... same amount of yeast to sugar ratio ~ last for about 2 weeks...
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larch replied the topic: larch's DIY CO2 Setup for 80 Litre Tank

tehmole wrote: i haven't use baking soda .. i'll try that next time...

how long does your mixture last? mines in a single OJ bottle ... same amount of yeast to sugar ratio ~ last for about 2 weeks...


3 weeks sometimes 4 depending on the ambient temperature. I am also playing around with brewers yeast it lasts longer and releases slower than normal yeast.
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