CO2 response time - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 01-13-2006, 01:15 PM Thread Starter
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CO2 response time

I built my Rex reactor and will be installing it this weekend. In my current setup I need a huge bubble count to get the CO2 level to be near the correct level in my 150g tank. That is why I built the reactor.

If we assume the Rex reactor will be more efficient (if it isn't I am going to be PO!), how long will it take to see a change in PH readings as I adjust the bubble count? Should I start with 1 bubble per second and check the PH in 1 hour, 2 hours, 3 hours?
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post #2 of 7 (permalink) Old 01-13-2006, 01:30 PM
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If you want to test whether it is more efficient, keep the same bubble count as you have now (what IS your current setup?) but plumb it through the new reactor. If the pH drops a little, it's more efficient. If it stays the same or rises, the reactor is equal or less efficient.

I would give it at least a day to let the pH stabilize, and make sure you take readings at the same time of day. HTH
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post #3 of 7 (permalink) Old 01-13-2006, 01:51 PM Thread Starter
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I have pressurized CO2 that goes through a solenoid (on light timer) to the needle valve and then into the intake on a Magnum 350. The bubble stream is too fast to count.

The question isn't how to figure out if the new reactor is more efficient. I really want to know how quickly readings change so I can check the PH to see if I am injecting too little or too much. (More the latter so I don't stress the fish.)
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post #4 of 7 (permalink) Old 01-13-2006, 02:59 PM
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FYI On my 55 with Rex Reactor, I use about ~1 BPS (60 bpm) to get ~30 ppm CO2.
I let it run overnight before retesting.

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post #5 of 7 (permalink) Old 01-13-2006, 03:07 PM
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I'd let it run at least 4 hours...that should be enough to see a change...but isn't necessarily long enough for it to equalize...meaning pH could still drop further after 4 hours.
Overnight is really how long it should go before you decide if you need to increase/decrease CO2 flow.
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post #6 of 7 (permalink) Old 01-13-2006, 03:18 PM Thread Starter
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taz -

Have you ever turned off your surface skimmer to see if that affects the CO2 concentration?
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post #7 of 7 (permalink) Old 01-13-2006, 03:26 PM
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Sorry no I haven't. Honeslty, there isn't much tubulance in the overflow, so while it is probably outgassing some, I doubt (only a semi-educated guess) it's losing much.

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