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Old 04-05-2012, 11:18 AM   #1
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Question To the DIY CO2 Experts....

Will you please let me know if I can connect the two litre bottle and my bubble counter to the penn plax sponge filter? Is that possible? I was thinking of having that internal filter as the diffuser for the CO2.

Also, can a long length airstone be a diffuser too? Will I need the pump for both possible diffuser or not anymore?

Please let me know. Any help is greatly appreciated.
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Old 04-05-2012, 11:20 AM   #2
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oppss one more question....is there any way you can turn off the CO2 at night or the check valve is already going to do that job?

Thanks in advance.
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Old 04-05-2012, 01:55 PM   #3
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Using the filter as a diffuser will work, but the agitation of a sponge filter will off-gas a lot of your CO2. You'll still need an air pump. If you've got enough CO2 pumping into the tank that you can run a sponge filter, you'll poison the fish.

Airstones can also be used, but they put out bubbles that are larger than optimal.

DIY CO2 runs day and night. A check valve only stops water from siphoning down the tube to the bottle. Pressurized setups use a solenoid valve to shut off the CO2.
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Old 04-05-2012, 02:59 PM   #4
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Quote:
Originally Posted by BigJim View Post
Using the filter as a diffuser will work, but the agitation of a sponge filter will off-gas a lot of your CO2. You'll still need an air pump. If you've got enough CO2 pumping into the tank that you can run a sponge filter, you'll poison the fish.

Airstones can also be used, but they put out bubbles that are larger than optimal.

DIY CO2 runs day and night. A check valve only stops water from siphoning down the tube to the bottle. Pressurized setups use a solenoid valve to shut off the CO2.
Thank you for the reply BigJim. But I still have a question. Sorry. So with the filter, where will I connect the tube from the litre bottle? to the filter directly? That area where I will put the tubing is the area that connects to the pump. So how am i going to do it?

My airstones actually are those long slim rectangular that is connected to my hawkeye 201 pump. and as far as I see, the bubbles that comes out on that thing is not very fast and not a lot. Can I use this one as a diffuser?
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Old 04-05-2012, 08:22 PM   #5
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Try the air stone. Before I went to a pressurized system, I used a piece of the free chopsticks from the local Chinese restaurant. If it plugged, I'd just chop off a new piece.
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Old 04-05-2012, 08:34 PM   #6
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As for turning it off at night there are a couple things you could do. What i do is went out and bought a cheap air control valve and when night time comes around i just take the screw part out. The CO2 goes out into the air instead of the tank. Also you could put an airstone on a timer so it turns on when the lights go out (or just plug it in when you turn the lights off) that would gas off the CO2 at night.
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Old 04-05-2012, 10:59 PM   #7
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Quote:
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Try the air stone. Before I went to a pressurized system, I used a piece of the free chopsticks from the local Chinese restaurant. If it plugged, I'd just chop off a new piece.
Okay. I will do the air stone. I am not sure if i get the chopsticks in my head correctly. You connect the tubing from the co2 to one end of the chopsticks then put it in the tank?
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Old 04-05-2012, 11:01 PM   #8
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Quote:
Originally Posted by Sake View Post
As for turning it off at night there are a couple things you could do. What i do is went out and bought a cheap air control valve and when night time comes around i just take the screw part out. The CO2 goes out into the air instead of the tank. Also you could put an airstone on a timer so it turns on when the lights go out (or just plug it in when you turn the lights off) that would gas off the CO2 at night.
Thanks sake. I did hear about that unscrewing the tube from the air valve and it will go to the air. But they said it will ruin the valve faster?

The airstone method is a good one. I could do that. Thanks.
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Old 04-05-2012, 11:09 PM   #9
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The valves are pretty cheap, I think you can pick them up for 2 or 3 bucks for 5 of them. And honestly I can't see it degrading the plastic valve all that quickly. I've had mine going for about 2 months and haven't noticed any degrading.
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Old 04-05-2012, 11:34 PM   #10
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build a diffuser that runs on electricity (many different kinds) and have the diffuser run with the lights. No lights = no diffuser. Sure the co2 will still pump, but without diffusion, there won't really be enough to effect the ph.
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