CO2 Bubble Rate Drops Daily - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 02-12-2018, 08:38 PM Thread Starter
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CO2 Bubble Rate Drops Daily

First time posting first time planted tank start up. So completely new setup, I went with a GLA Pro advance system with their Atomic inline diffuser. To date I have not messed with the Ph controller as I wanted to learn how to set up up manually using a drop checker and bubble counter. The trouble I am having is that set for example a rate of 2 bps. I have been timing by counting the bubbles for 30 seconds then doubling. The problem is that each day when the timer turns on the solenoid I am at a lower bubble rate. It may drop from 60 56 to 52 to 47 over the course of four days. I can set it wherever I want and ti will stay consistent for that day but the next day it will be lower. I emailed back and fourth with GLA and they assure me it is not the solenoid. They spoke of back pressure and a possible dirty diffuser. Well, everything is brand new and clean & I don't see how back pressure would cause the bubble rate to stay at one rate all day, then drop to a lower rate for the next day day after day??? Very confused, would really appreciate some guidance. Thank You!
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post #2 of 7 (permalink) Old 02-12-2018, 10:12 PM
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Is the working pressure changing by chance? If so that can cause the bubble count to drop. Only other thing I can think of is the needle valve is drifting.

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post #3 of 7 (permalink) Old 02-12-2018, 10:23 PM
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Yes, I use two of those diffusers and I set my working pressure to 40psi. It's recommended a minimum of 35psi for them. If you've got that set and it's not changing, I agree it could be the needle valve.

Also, something to note and you may have already noticed this - you need to give the co2 system some time after it turns on when you're dealing with a diffuser like that. The back pressure they may be referring to is the fact that the system, when it comes back on, has to build pressure back up in the lines until there's enough pressure for the gas to penetrate the ceramic disc in the atomizer. I noticed my bubble count would start high and then settle back down to where I had set it after the line developed pressure. So if you're trying to make your adjustments when the co2 first kicks on, wait 10 minutes and then make your adjustment.
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post #4 of 7 (permalink) Old 02-12-2018, 10:51 PM
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Other options.. Small leak, sticky check valve..

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post #5 of 7 (permalink) Old 02-13-2018, 02:16 AM Thread Starter
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Working Preasure

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Originally Posted by Nlewis View Post
Is the working pressure changing by chance? If so that can cause the bubble count to drop. Only other thing I can think of is the needle valve is drifting.
The working pressure has only changed whenI have adjusted it to see if that makes a difference. It seems to drop less the higher the working pressure. I started at around 37psi and moved up to around 42psi & down to 32. Starting today I am at 40psi & plan to run it a few days at that. The drifting needle valve seems to make sense. Something else I noticed, at the lower psi the bubble rate would slow down then speed up but retain the rate of the day while doing so if you are counting bubbles per 30 seconds. But the range was also lower the next day. I assume speed up and slow down was due to inadequate pressure.

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Quote:
Originally Posted by mgeorges View Post
Yes, I use two of those diffusers and I set my working pressure to 40psi. It's recommended a minimum of 35psi for them. If you've got that set and it's not changing, I agree it could be the needle valve.

Also, something to note and you may have already noticed this - you need to give the co2 system some time after it turns on when you're dealing with a diffuser like that. The back pressure they may be referring to is the fact that the system, when it comes back on, has to build pressure back up in the lines until there's enough pressure for the gas to penetrate the ceramic disc in the atomizer. I noticed my bubble count would start high and then settle back down to where I had set it after the line developed pressure. So if you're trying to make your adjustments when the co2 first kicks on, wait 10 minutes and then make your adjustment.
I did catch on right away that it goes really fast at start up but the problem is consistent well after start up. If I don't have any luck over the next couple days I will have to pester GLA about the needle valve!

Thanks for the feedback!!
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post #6 of 7 (permalink) Old 02-15-2018, 06:31 PM
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I have similar set up and I did not see a consistent bubble rate until I got to 42 working pressure...
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post #7 of 7 (permalink) Old 02-16-2018, 06:45 PM
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I've owned 2 atomics and they need over 40psi to function correctly. 45psi is about right.
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