Cover both bottles with the caps that have been fitted with air tubing. Best way is to spin the bottles till caps are tight rather then spinning the lids which can potentially break the seal. It is important to connect a check valve to the air tube that enters the aquarium from the home made CO2 system so water from the fish tank doesn't flow back into the bottles. Once all the connections are finalised then attach an air stone to the end of air tube that will be suspended in the fish tank.
An air stone will increase the circulation and will also ensure that higher percentage of CO2 can be absorbed in the tank water. Adding an air stone will also increase the surface area of water compare to the CO2 feed into the aquarium from the CO2 diffuser.
Some times it may take longer if the mixture is not balanced, so don't stress and leave it for bit longer as CO2 will be eventually generated. If you are a type of person who can learn quicker from watching videos then take some time and visit my Youtube channel as i have uploaded quite a few videos on similar content.
I will be more than happy to assist with any questions and looking forward to your feedback or suggestions in the comment section below.
You might like Show more. Your call. Ok, this is the part where I messed up when I was taking the pictures.
Bear with me. About inches away from the cap, cut the line in half, and plumb in your check valve. The picture is of the finished project. Just pretend you don't see that part though ;. Now, here is the messy part. You want to use your aquarium silicon to put a nice bead around the inside and the outside of the bottle cap, sealing your tube to the cap.
To smooth out the bead if you messed up, you can dip your finger in rubbing alcohol, and run it along the silicon. This will keep it from sticking to you too much. You want to let this dry for 48 hours before using the setup.
Now, you want to make sure that your cap still fits. I got silicon on the threads of my first bottle cap, and it really messed with it, and I couldn't use it.
I don't think I need to explain how to put on a bottle cap. I'll give you guys some credit. Now, plug your air diffuser into the other end of the line. It should fit fairly snuggly, and thats what we want. Now, you want to add you suction cup to the end of the line with the air diffuser. Depending on your suction cup, the last step may or may not come before this one. I had to cut the side of my suction cup to get the airline to fit, so it came after in my situation. Now you are ready to place the air diffuser in your aquarium.
Ok, now its time to mix up your "CO2 juice". I don't have any pictures of this, but its just like following a recipe.
First, you fill your bottle half way up with pretty warm water. You don't want it too hot, but not too cool. Now you want to add 1of cup sugar. You will need an extra cap that fits the bottle. You want to shake the hell out of it until you can dissolve as much sugar into the bottle that you can. Fill the bottle up to about 2 inches away from the top with COLD water. Put on the other cap, and shake it some more.
You want the water to be a little warm. Too hot, and it will kill your culture. Now add teaspoon of bakers yeast, and just a pinch of baking soda. Give it a gentle shake. So when the pressure is higher in bottle A than in bottle B gas will want to flow from A to B. A consequence of this is that citric acid is injected into bottle B when the pressure in bottle A becomes higher than that in bottle B, which in turn creates more CO2.
This additional gas is pushed into bottle A as well as your diffuser , again making an equilibrium but in reverse to before.
When the pressure in B falls below A, citric acid is again pushed from A to B, and so the cycle continues. It's an ingenious system! Coke or Sprite. Bottle A g Citric Acid Powder. Mix with ml Water until dissolved. To start, citric acid or vinegar is poured into bottle A, and a mixture of baking soda and water is poured in bottle B.
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