Bpm and co2 Levels - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 01-22-2005, 06:41 PM Thread Starter
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Bpm and co2 Levels

Just added a Hagen Ladder to my DIY co2 in my 37 gallon and counted 42 bpm. Ph 6.8, KH 4.8:85ppm. So that makes co2 23ppm?? Does that sound like an accurate measurement or not for that bubble count.
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post #2 of 9 (permalink) Old 01-23-2005, 01:07 AM
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Bubble rate has nothing to do with CO2 levels. There is so much variance in bubble size that it's meaningless.
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post #3 of 9 (permalink) Old 01-23-2005, 01:25 AM
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Bubble rate sure has been a popular topic lately... lets dispense of some myths here.
Like Rex says it has nada to do with it. Its all in the water chemistry and the choice you make in a reactor or diffuser to get the CO2 into the water column.

I would take 10bpm in a good reactor over 100bpm in an airstone. Its all in how you are getting the CO2 to be at its best efficiency.
Also to dispense a bit of the bubble rate myths think of this...
Lets say you have 20bpm in one tank with water that has a KH of 4 and then you have 20bpm going into another tank with a KH of 15. Are the bubble rates going to be a factor anymore?

Your ph will let you know if the bubble rate is enough...no 2 tanks are the same.
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post #4 of 9 (permalink) Old 01-23-2005, 05:01 PM
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But, but, but... . I'll resist the urge. I'd hate to get on the bad side of two of the sites granddaddies! (And, that's not (completely) meant to be an age joke. I was born in the same month as Rex only a year later!)

Just wanting to understand "everything"...
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post #5 of 9 (permalink) Old 01-24-2005, 11:00 AM
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I'd hate to get on the bad side of two of the sites granddaddies!
LMAO ! If you still have reservations about it then by all means speak up, like you say, you want to understand "everything".
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post #6 of 9 (permalink) Old 01-25-2005, 01:16 AM
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How to use bubble rates

I suggest that you make a chart of the bubble rate and the ph at that time. Convert that to CO2 with your normal KH (assuming it does not vary much).

Now, you can *roughly* tell the CO2 level from the bubble rate -- for your tank, assuming everything else is pretty much the same; KH, fish load, waste load, gassing off losses, reactor efficency, tank temp, and so on.

What you want to know is what is the lowest bubble rate that is still giving you a good CO2 level. So, when you see "X" bpm, you know it is time to change the mix in the DIY. That number might be 15 bpm, or it might be 5 bpm, it all depends on what happens in your tank and how much a swing you want to tolerate in the CO2 levels.

With the ladder, you can go one step further and count the bubbles visible at one moment. I found that number of visible bubbles was very close the the bpm rate and so I knew if there were "Y" number of bubbles or less visible at one moment then it was time to refresh the mix.
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post #7 of 9 (permalink) Old 01-25-2005, 03:01 PM
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Ok, I'll validate you

42 bpm on a DIY setup is a pretty good CO2 generation rate for DIY. I could see that giving you 23ppm of CO2 in a tank with only 4.8dKh. You don't have a ton of buffering, but enough for CO2 injection, so it'll 'accept' the CO2 more readily than a high dKh tank.
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post #8 of 9 (permalink) Old 01-26-2005, 11:08 PM Thread Starter
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So are you saying that the higher kH is the harder it is to retain co2.

40 gallon SeaClear Acrylic, 192 watt Orbit Lunar PC, Filstar XP2, Filstar XP1, JBJ Regulator, Rhinox 5000 glass co2 diffusor, 9 watt UV sterilizer, Hydor Inline Heater, Pool Filter Sand substrate
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How comes shoppings so stupid, looks at all this stuff I haves, what do I do's with it.
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post #9 of 9 (permalink) Old 01-27-2005, 04:47 PM Thread Starter
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After I mixed a new batch of co2 my bubble rate has shot up to over 90 bpm.Now my co2 level is at 54 ppm( pH 6.4- dkH 4.5) . The ladder seems to make a big difference compared to an airstone for co2. The highest I got with the airstone was 20ppm. I must have high oxygen because my fish are doing fine.

40 gallon SeaClear Acrylic, 192 watt Orbit Lunar PC, Filstar XP2, Filstar XP1, JBJ Regulator, Rhinox 5000 glass co2 diffusor, 9 watt UV sterilizer, Hydor Inline Heater, Pool Filter Sand substrate
Filstar pimp #53

How comes shoppings so stupid, looks at all this stuff I haves, what do I do's with it.
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