Question on my KH, Ph levels
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Old 07-02-2004, 04:23 AM   #1
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Question on my KH, Ph levels


After reading chuck's article on co2 I decided to measure the amount of KH and Ph in my water to determine what amount of co2 I needed for my new tank. The tap water has a high Ph of around 8.3 and a KH of 3 degrees which gives me a low co2 reading. If I want to get a Ph target of around 7.0 what should my co2 bubble per second or is it minute be? I used to use Ph up and a powder to equalize the Ph to acceptable levels... I never knew that my ph was that high off the tap though. Whenever I measured the Ph in my tanks they always were in the acidic side ~6.4, hence the use of Ph stabilizing chemicals.

I'm just so surprised and overwhelmed at the results.. why would the readings be different from the tap and when I put it in the tank? Could it be the water purifiers that I use or the driftwood or substrate...

I'm going to check the water readings in my tanks...

Finished testing the 72g and the ph is ~7.6 and KH is 5 degrees which gives me a co2 of 4ppm. I don't have any co2 injecting into the water yet, still waiting for co2 parts and lights.

Overall I think the water in my 6gal was oversaturated with co2 (or fish waste) from not having changed the water for so long. So, I'll go change the water right now... even though it's close to 10pm... But hey, that's what hobbyist do ...

So I checked the parameters of my 6 gal tank which I have not changed the water for the past 2 weeks (cuz I was sick) and the Ph was around 6.6 and the kh was 6 degrees which according to the calculator is 45ppm in co2. oh I have a hagen co2 generator. I guess I should change the water soon .

Now to check the big 72g tank..
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Old 07-02-2004, 04:36 AM   #2
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Poohbee,

It could be caused by all you just mentioned. Don't use anymore chemicals to alter your pH from now on. You won't be able to get right CO2 reading if you use those not to mention you may get pH swing if not used properly or with RO water.

What water purifier do you use? Driftwood can lower pH but not that much. Your high pH tap water is caused by low CO2 level. Once it's out in the open, it dissolves CO2 hence ph would drop. My guess is it would drop to around 7.4 if your KH is 3. Take a bucket of tap water and let it sit overnight (aerate it if possible). Check the pH after 24 hours. The pH in your tank should be at that level if there is no buffer in there. Injecting CO2 will also lower pH.
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Old 07-02-2004, 04:50 AM   #3
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Thanks for the reply Ninoboy.

I updated my original post with more info. Hope that clears things up..

I guess I have to play around with the Bubble rate to get the optimal balance of Ph and co2 levels... Should I start out at a particular bubble count (~20 bubbles/sec) just by looking at my water parameters?
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Old 07-02-2004, 05:10 AM   #4
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Yes, you should experiment with the bbm yourself. Check the pH once before the light is off and once before the light is on in the morning. You want the targeted pH achieved early in the morning. All tanks are different and a lot depending on how efficient your reactor also. Which tank are you injecting CO2? If it's the 72gl, you could start with 30bbm or even more. For the 6 gl tank, I would start with 6bbm. In my 5 gl tank, I manage to keep CO2 level at 20ppm just with 8bbm.
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Old 07-02-2004, 10:39 AM   #5
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Yeah I'm going to be using a pressurized co2 system in my 72gal. My 6gal has the Hagen co2 generator which I can't control the bubble rate.
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