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Cthulhu 12-25-2012 08:49 PM

How long will a CO2 bottle last?
For a 95g tank, how long will a 20lb CO2 bottle usually last before I need to refill it?

I'm the kind of lazy person who doesn't want to go refill a CO2 bottle too often, and I'm wondering if it would be a good idea to buy a 50lb!

l8nite 12-25-2012 09:38 PM

My 29G is on a 5lb tank and has been running steadily for 8 weeks now... I know that probably doesn't help much, but I think you won't need to worry about it more than a couple times a year.

TheKribKeeper 12-25-2012 09:39 PM

My 5lb co2 tank lasts about 4-5 months at about 4-5 bubbles per second so that will give you a rough idea. I figure a 20lb tank would last around 16 months at that bubble rate. Less if you have a higher bubble per second. Again just a rough estimate. You should get at least a year between refills I would think. Maybe less thats a big aquarium.

TheKribKeeper 12-25-2012 09:42 PM

I prefer the smaller co2 tanks because if a 20lb tanks burst disk blows it could suffocate you quickly if it is in an area with poor ventilation. Not likely to happen but always a possibility. Just food for thought.

DarkCobra 12-25-2012 09:43 PM

There's a LOT of variables. Ignoring them all to provide a VERY rough estimate, maybe 3-4 months for a 20lb.

Before considering a 50 pounder, make sure it won't be too much for you to lift. Should you have a relatively small leak, you can lose even 50lbs. of CO2 in just a few weeks, it's less painful to lose 20lbs. Should you have a massive leak, I think I wouldn't want to be in your house!

Two 20lb. tanks could be an alternative. When one empties, you can have it refilled at your leisure, instead of rushing to go do it.

danakin 12-26-2012 04:16 AM

Do NOT get a 50lb cylinder for use indoors. There's no need for that, and as mentioned above, in the case of a failure there is a far greater chance of asphyxiation. Stick to a 10lb cylinder, running at ~5bps it should last a good half year or more.

stevenjohn21 12-26-2012 05:08 AM

I have a 20lb on my 75 gallon which runs 24/7 , drop checker stays green at around 1bps and I'm on my 2nd month.

kevmo911 12-26-2012 05:58 AM

My guess is a solid 6 months on a 95g with a 20#.

Centromochlus 12-26-2012 06:02 AM

I was able to get almost 3 months out of a 5lb tank on a 90G... I don't see why you wouldn't get at least 10-11 months out of a 20lb.

paul104 12-26-2012 10:46 AM

I hope so it will almost pass your 24 to 25 week easily Then may be you need to refill it But if you are too lazy then you must buy another one So that you can refill them both at the same time

jester56 12-26-2012 03:01 PM

Danakin is right. Stay away from a 50lb cylinder. They're about five feet tall and weigh around 175 lbs. I'm running a 5lb for over three months now in a 50g tank. You can get one on Amazon for around $70. The "buy two" idea sounds like it would fit your needs...

FishFlow 12-26-2012 05:41 PM

Running 20# on 100g & 37g, when running 8-10hr days, got 6 months before refill.

Cthulhu 12-26-2012 07:48 PM

Well then it seems a 20lb will suit my needs!


Originally Posted by jester56 (Post 2124930)
Stay away from a 50lb cylinder. They're about five feet tall and weigh around 175 lbs.

I was under the impression that a 50lb bottle weighted 50lb...?

kevmo911 12-26-2012 07:58 PM

The weight rating on a cylinder is the weight of the liquid CO2 it can hold. The cylinder itself weighs more. An aluminum cylinder is much lighter than a standard steel cylinder.

jester56 12-26-2012 09:04 PM

Thanks, kevmo! Exactamundo. That's why I tried to explain in another thread about the 20oz CO2 paintball tanks needing to be drained all the way to get an accurate fill because of the variance in vessel size. And as I said before, anyone in the New Orleans area that has questions or need with CO2, PM me. We have a full servcie paintball shop and I can fill your cylinders at a nice discount if you mention TPT...

20lb cylinder should more than fill your needs Cthulu! Good luck!

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