CO2 injector questions

[Airforceman]

Yes this is another post about the DIY CO2 injector :rolleyes: .

1) I've read all about making this DIY CO2 injector and I've read one person saying that the bottle should be upside down and another saying that it could be right side up. Which one would be the best?

2)When you put the airline tubing into the bottle how far should it go in. Should it be in the Yeast etc. mixture or in the air?

Thanks in advance,

[Mgamer20o0]

never read it should be upside down before..... it should be right side up so the cap is facing the sky.

i put my airline tube 3/4 a inch. dont put it in the yeast mixture.

[Airforceman]

Thanks a lot I'll try and find where it was stated and post it

[Airforceman]

actually another question for somebody lol. Can you put the bottle of the mixture anywhere? Like above or below the aquarium? because with water it always has to drain down. Is there anything special about where you put it about the aquarium?
Thanks again,

[Rex Grigg]

If you don't have a check valve installed then you are best off putting it level with or above the water line.

[Mgamer20o0]

yes i put mine above the tank. if you dont have a check valve like rex said you could end up with the mixture in your tank if its bellow the tank.

[Sammie7]

yes i put mine above the tank. if you dont have a check valve like rex said you could end up with the mixture in your tank if its bellow the tank.

How do you figure that? The fluid would move down with gravity, right? So if you have it above your tank then it would go into the tank, and if you have it below the tank then a siphon would start and drain water from the tank into the bottle.

Bottle above water level= yeast mixture in tank
Bottle below water level= tank water in bottle

Check valve's do not stop yeast mixture from going into the tank. To do that you would need a gas separator/ bubble counter that would catch the yeast mixture before it got into the tank.

[lazyNode]

True. But I'd rather tank water in my yeast than vise versa.

A check valve won't stop yeast going into the tank. But that would be a pretty explosive mixture to get into the tank. Which is why I use a 1 metre length of tube and only fill my Co2 bottle half way.

The check valve should stop water going into the bottle anyway. Which will still allow you to refill the bottle, and the new gas should push the water back into the tank anyway.

That's what I figure if the bottle is below the water line.

[Sammie7]

True. But I'd rather tank water in my yeast than vise versa.

A check valve won't stop yeast going into the tank. But that would be a pretty explosive mixture to get into the tank. Which is why I use a 1 metre length of tube and only fill my Co2 bottle half way.

The check valve should stop water going into the bottle anyway. Which will still allow you to refill the bottle, and the new gas should push the water back into the tank anyway.

That's what I figure if the bottle is below the water line.

I hear you. I rather not have to worry about doing massive water changes and stressing my fish out from having the yeast mix going into the tank. That's why you should either keep the bottle below the tank or get a gas separator to be safe from that happening. I could care less about the yeast mix getting messed up from tank water going into it compared to having the whole balance of my tank screwed up.

[Mgamer20o0]

How do you figure that? The fluid would move down with gravity, right? So if you have it above your tank then it would go into the tank, and if you have it below the tank then a siphon would start and drain water from the tank into the bottle.

Bottle above water level= yeast mixture in tank
Bottle below water level= tank water in bottle

Check valve's do not stop yeast mixture from going into the tank. To do that you would need a gas separator/ bubble counter that would catch the yeast mixture before it got into the tank.

the water can go into the diy bottle if its bellow the tank. once its filled the mix can go up the tube into your water. if its above the tank the tank water wont be able to siphon into the diy co2 and wont get into the tank. well

[Sammie7]

the water can go into the diy bottle if its bellow the tank. once its filled the mix can go up the tube into your water. if its above the tank the tank water wont be able to siphon into the diy co2 and wont get into the tank. well

How do you figure that? Still doesn't make sense to me how the liquid would travel upwards. If that was so, how would we be able to gravel vac our tanks? We rely on gravity to pull the water down from the tank(which is higher than the bucket) down into the bucket. People who keep the bucket level with or above the tank cannot get a good suction started, because that is not the way the water is meant to flow. It would not try to go against gravity.