Optimal Bubbles per Minute (BPM) - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 10-01-2004, 11:30 PM Thread Starter
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Optimal Bubbles per Minute (BPM)

I am having trouble finding in the Search's what the optimal BPM is... right now I have 2 2L bottles going and am getting about 1 bubble every 4.5 seconds.. which is about 13-15 BPM. The culture is only 2 hours old, so maybe it will speed up.. but not sure if I would want it to anyway!

Also, is the BPM a good measure of when the cultures need to be shaken or re-done? I would assume yes... so what is the range I should aim to keep it at?

And this is on a 50g.

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post #2 of 6 (permalink) Old 10-01-2004, 11:58 PM
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It's an impossible question to answer. Too many variables. But you will be hard pressed to OD a 50 gallon tank with DIY CO2.
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post #3 of 6 (permalink) Old 10-02-2004, 12:05 AM
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Good luck trying to keep a 50 gallon tank "optimum anything" with yeast mix...a tank that large needs steady amounts of CO2 only provided with pressurized bottles.

As far as a bubble rate goes it all depends on your methods for diffusion of the CO2 ... powered reactor ? Ramp? Filter ? It all matters, also the water par's matter... whats the KH/GH like to accept the CO2 ?

Also, is the BPM a good measure of when the cultures need to be shaken or re-done? I would assume yes... so what is the range I should aim to keep it at?

Yes.. the bubble rate tells you when the culture is failing... I do not miss the yeast bottles at all but they do work great for smaller aquariums.
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post #4 of 6 (permalink) Old 10-02-2004, 01:07 AM Thread Starter
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I may look into getting a Pressurized. Is it expensive to maintain the systems though?

I know the initial cost is ~$300 for a decent one, but what about refills, etc. And how often do you have to refill it?

I will see how well this DIY with 2 2L's works out and then make a decision.

To answer your water param questions:

KH = 4.5
GH = 5

and I just have a diffusor right now. looking into making a reactor if this Boyu glass difussor doesn't work well.

Cliff
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post #5 of 6 (permalink) Old 10-02-2004, 04:58 AM
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You can set up a manual system for around $150. And how often you have to fill it depends on how large a cylinder you get. A 10 lb cylinder should last close to a year and normally runs $10-$20 to get it refilled.

If you want more info on how to get a system up and running for around what I quoted just ask.
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post #6 of 6 (permalink) Old 10-02-2004, 04:58 AM
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I stuck with DIY for a 29g and then my newer 46g for a couple of years, but I never was diligent enough to keep them refreshed. So, after some searching around, I ordered one of the all-in-one regulators w/ solenoid, got a new 10 lb aluminum tank w/ CO2 and built a DIY external reactor. The total price was under $250. The price for a CO2 tank refill is in the $9-$11 range, and with 10 lbs, I'm expecting my current tank to last around 12 months.

I've decided that the hour or so I save with not having to wrestle with the DIY CO2 plus the ongoing costs of the pressurized system ($10-$20/yr) actually makes a pressurized system cheaper in the long run. Then again, it's easy to rationalize that after the initial expenditure .
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