How long does 2kg CO2 last @ 1bpm? - The Planted Tank Forum

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post #1 of 20 (permalink) Old 10-29-2013, 11:59 PM Thread Starter
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How long does 2kg CO2 last @ 1bpm?

Hi all. Just a quick question regarding how long your CO2 lasts. Any examples more than welcome, e.g. a 2kg fire extinguisher running at 1 bubble per min (edit, I meant per second) as an example.

Any example of how often you have to change your tank with x amount of useage would be much appreciated - I don't need anything massively specific, just a rough idea.

Thanks.

Last edited by Jeynesey; 10-31-2013 at 03:30 PM. Reason: Correction on minutes to seconds
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post #2 of 20 (permalink) Old 10-30-2013, 01:10 AM
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There are too many variables here; how long is your CO2 on for? Bubble size (i.e. how are you counting the bubbles)?

Of course, more importantly, is your entire setup completely leak free?

Anthony

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post #3 of 20 (permalink) Old 10-30-2013, 01:13 AM
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post #4 of 20 (permalink) Old 10-30-2013, 02:57 AM Thread Starter
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That search link doesn't work. Sorry if I have missed some often discussed topic but I can't find anything with anything I'm searching for.

I'm not after anything massively accurate, just a rough estimate for 8 hours a day, using a proper bubble counter. I have done DIY in the past and didn't like it - I just want to do it properly and I'm deciding between the different sizes of fire estinguisher / cannister.
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post #5 of 20 (permalink) Old 10-30-2013, 03:06 AM
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Get the biggest tank you can fit/afford.

Search for the words in the title: how, long, and co2. There's like fifty threads on it.
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post #6 of 20 (permalink) Old 10-30-2013, 03:34 AM
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Why would you want 1 bubble per minute? That won't affect anything.

40 Breeder in progress...
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post #7 of 20 (permalink) Old 10-30-2013, 03:48 AM
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Maybe he referring to 1 bubble per second. Lowest you can go is about 0.5 bubble per seconds.
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post #8 of 20 (permalink) Old 10-30-2013, 05:03 AM
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Quote:
Originally Posted by urbach View Post
Maybe he referring to 1 bubble per second. Lowest you can go is about 0.5 bubble per seconds.
0.5 bubbles per second = 1 bubble every 2 seconds.

It is possible to achieve lower rates with a good metering valve.

Anthony

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post #9 of 20 (permalink) Old 10-30-2013, 06:34 PM Thread Starter
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Yes I meant per second, I must have had beats per minute stuck in my head from music.

Anyway, I searched "How long CO2" and after 10 mins of reading, none of the threads answer the question.

I dunno why it's so hard to just say "I run a 2kg at 2bps for 8 hours and I refill it every 6 months", rather than taking the trouble to post twice about how I should be searching for something that's clearly not as easy to find as you think it is. I've searched google and on here and can't find an answer.

Thank you.

edit p.s. - Darkblade, though I can't see the answer to this particular question in it, I found this thread of yours which is very good, so will save that to read later - thanks for writing it. Pressurized CO2...Just thought I'd share.
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post #10 of 20 (permalink) Old 10-30-2013, 11:53 PM
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I have a 5lb canister. 2 kg is equal to 4.8 lbs. I run two tanks with co2 on 11 hours a day. The canister lasts about 3 months.
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post #11 of 20 (permalink) Old 10-31-2013, 02:53 AM Thread Starter
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Quote:
Originally Posted by Positron View Post
I have a 5lb canister. 2 kg is equal to 4.8 lbs. I run two tanks with co2 on 11 hours a day. The canister lasts about 3 months.
Excellent, thanks very much. How many bubbles per second total?
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post #12 of 20 (permalink) Old 10-31-2013, 04:57 AM
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Quote:
Originally Posted by Jeynesey View Post
Yes I meant per second, I must have had beats per minute stuck in my head from music.

Anyway, I searched "How long CO2" and after 10 mins of reading, none of the threads answer the question.

I dunno why it's so hard to just say "I run a 2kg at 2bps for 8 hours and I refill it every 6 months", rather than taking the trouble to post twice about how I should be searching for something that's clearly not as easy to find as you think it is. I've searched google and on here and can't find an answer.

Thank you.

edit p.s. - Darkblade, though I can't see the answer to this particular question in it, I found this thread of yours which is very good, so will save that to read later - thanks for writing it. Pressurized CO2...Just thought I'd share.
You're missing the point. It is going to be wildly different for everyone. Your bubbles, my bubbles and the bubbles of Fred down the street are all going to be different. There is no "ballpark" answer to your question.
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post #13 of 20 (permalink) Old 10-31-2013, 02:00 PM Thread Starter
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Quote:
Originally Posted by xmas_one View Post
You're missing the point. It is going to be wildly different for everyone. Your bubbles, my bubbles and the bubbles of Fred down the street are all going to be different. There is no "ballpark" answer to your question.
If there is no answer to the question, why tell me to go and search for an answer to the question?

If 10 people gave their stats / timescales, that's as good an estimation as it's possible to get and is vastly more accurate than me just guessing. As far as I know at this stage, a 1kg bottle at 1bps could last anywhere between a month and a year; I have literally no idea.
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post #14 of 20 (permalink) Old 10-31-2013, 05:09 PM
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Quote:
Originally Posted by Jeynesey View Post
As far as I know at this stage, a 1kg bottle at 1bps could last anywhere between a month and a year; I have literally no idea.
Unfortunately, thats your answer. I know thats a little frustrating but theres no reason to not buy the biggest size tank you can fit and afford.

BPS is more for making individual adjustments on your specific set up, a visual aid lets call it. Its there so you can visually check the increases/decreases youve made, thats it.

Heres an example, lets say you refill your co2 tank and have to readjust your needle valve/pressure. Previously you were running your tank at 10psi and 2bps so you know you can set the pressure back to 10psi and adjust the needle valve back to 2bps and youll be back injecting at the same rate you were before.
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post #15 of 20 (permalink) Old 10-31-2013, 05:15 PM
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I'll give a ballpark estimate of lasting 10 months, assuming your bubbles are average sized ones coming out of common bubble counters, running about 8 hrs a day.

Regards, Dennis
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