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post #1 of 8 (permalink) Old 11-11-2014, 01:34 AM Thread Starter
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Question kh buffers

I am looking for some input. I have a 38g tank no fish. I recently started up my first pressurized co2 setup. water parameter are ph 5.8 and kh 3 gh 4.
still reading blue on my drop checker at 2 bps. i use 4dkh reference. should i not be seeing the drop checker turn yellow? my understanding is at with decently efficient diffusion i should be close to l00ppm co2......i know that that is not correct. Do i need to add potassium carbonate to raise my kh?
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post #2 of 8 (permalink) Old 11-11-2014, 02:29 AM
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yea i have the same problem with my kh here is a link https://www.plantedtank.net/forums/sh...d.php?t=146029
and im a little confused about your drop checker, you want it to turn yellow, If im correct its supposed to turn green if it is at the ideal lvl of co2 or in other words 30ppm any higher will show blue and any lower will show yellow or a light green/yellow
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post #3 of 8 (permalink) Old 11-11-2014, 03:10 AM
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Something is inconsistent with your water parameters. If your pH is as low as 5.8 you almost certainly have a high CO2 concentration in the water, so a properly set up drop checker should be light green to yellow. If your KH test kit is giving you the wrong reading and your KH is really closer to 1 than 4, then this could be consistent. Or, if your pH test is from using a pH probe that isn't well calibrated, the pH could be closer to 7 than 5.8, and that would be consistent. Since your drop checker remains blue, after a couple of hours of CO2 injection, it is very unlikely that you have more than about 10 ppm of CO2 in the water.

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post #4 of 8 (permalink) Old 11-11-2014, 03:24 AM
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What's your ph before adding co2? And after co2 in a couple hours?

Bubbles per seconds doesn't mean anything. Adjust until you get the desired concentration.


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post #5 of 8 (permalink) Old 11-11-2014, 08:30 PM Thread Starter
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My drop checker did finally turn green. it just seems like the lag in response was excessive 4+ hours...... I will check parameters again. I use API test kit (not strips) and do not have a PH probe so no calibration issues. My PH was 7 before adding co2 and i let water sit overnight and returned to 7 after degassing. Is the any factors that could give a false KH reading besides human error..??
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post #6 of 8 (permalink) Old 11-11-2014, 10:28 PM
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It sounds like you're adding plenty CO2 if your initial pH is 7. Look at the plants if it's pearling. After awhile you'll look at the plants and fish to guess what the CO2 is.

The test kits are prone to human errors and chemical issues.
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post #7 of 8 (permalink) Old 11-12-2014, 12:46 AM
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Old test kits give wrong readings.
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post #8 of 8 (permalink) Old 11-12-2014, 11:40 AM Thread Starter
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OK. The plants are doing fine so I will just leave and see if any problems develop and adjust from there. Thanks for all the replies. My KH/GH test kit is about a year old probably time to get a new kit.
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