CO2 and kH - The Planted Tank Forum
 
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post #1 of 12 (permalink) Old 10-22-2004, 08:42 PM Thread Starter
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CO2 and kH

I'm in the process of setting up a DIY CO2 system...

Tap water comes out here at around pH 7, dKH 3 and dGH 5, when i add the CO2, i'm afraid that my pH will drop to much due to the low dKH...what should i do? add a pH buffer/stabilizer? add pH up?

Suggestions please!!!
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post #2 of 12 (permalink) Old 10-22-2004, 10:44 PM
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Add some baking soda.
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post #3 of 12 (permalink) Old 10-22-2004, 10:59 PM
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1 teaspoon Baking Soda per 50 gallons will increase the KH by 1 dH

get your KH between 4 and 6 and you wont have to worry about the pH crashing.

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post #4 of 12 (permalink) Old 10-23-2004, 12:04 AM
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I think a big factor in your pH drop is going to be the efficiency of your DIY set up, not your water chemistry as it is solely.

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post #5 of 12 (permalink) Old 10-23-2004, 01:48 AM
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Also you need to test your tap water after it has rested for a minimum of 12 hours. With a kH of 3 you should be seeing a pH of around 7.6
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post #6 of 12 (permalink) Old 10-23-2004, 02:50 PM Thread Starter
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Ok, so i left my tap standing over night and measured this morning...

pH: 7.5
dKH: 2
dGH: 3

So how should i adjust this to be stable for CO2 injection?


P.S. Awesome site rex.
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post #7 of 12 (permalink) Old 10-23-2004, 03:12 PM
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Still use baking soda to raise the KH.

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post #8 of 12 (permalink) Old 10-23-2004, 03:16 PM Thread Starter
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My 20L is cycling and these are the #'s atm...

pH: 5.0
NH3: 1.2
NO2: 5-6 (off the chart)
N03: 25
dKH: 1
dGH: 4

My KH and pH fell, so should i just add the baking soda now and get it back to 7ish?
Ammonia should be going to 0 soon, NO2 looks like it's spiking now...
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post #9 of 12 (permalink) Old 10-23-2004, 04:35 PM
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Raising your kH to 7 is pretty high IMO. I guess it may depend on what type of fish you are planning on having. I generally keep mine at 4-5 with baking soda...I too have a kH of about 1 out of the tap. Also, you can speed up that cycle by adding a lot of fast growing plants if you want.

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Originally Posted by Darks!de
My 20L is cycling and these are the #'s atm...

pH: 5.0
NH3: 1.2
NO2: 5-6 (off the chart)
N03: 25
dKH: 1
dGH: 4

My KH and pH fell, so should i just add the baking soda now and get it back to 7ish?
Ammonia should be going to 0 soon, NO2 looks like it's spiking now...

Re-boot!
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post #10 of 12 (permalink) Old 10-23-2004, 04:51 PM Thread Starter
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I meant i would raise the pH to 7 lol...the kH to about 3-4.
Yeah i have 2 anachris in there now...and am getting more plants later today...
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post #11 of 12 (permalink) Old 10-23-2004, 05:24 PM
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Don't worry about your pH. Simply increase your KH to around 4 with baking soda and the pH will automatically follow.
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post #12 of 12 (permalink) Old 10-23-2004, 06:06 PM Thread Starter
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yeah...i added 1 tsp and dKH is 3 and pH is a bit above 7...how how long is baking soda able to keep the KH up like this though? About how often do i need to add it to maintain dKH of 4?

Was just reading another post on KH raising using crushed coral...any suggestions for this? Read that it was 1/4cup for 90 gallons...anybody have good experience with this?

Last edited by Darks!de; 10-24-2004 at 04:05 AM.
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