KH goes UP when I add CO2 - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 02-04-2006, 06:37 PM Thread Starter
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KH goes UP when I add CO2

Over the past week I have observed a strange thing.. when I add CO2 my water's KH goes UP.

Using Aquarium Pharmaceuticals KH test kit: Out of the tap it's 20 dKH (!!!). A day after I start injecting CO2 it's up to 24. Today (after about 5 days of injecting CO2) it's up to 29!!!!

My pH is at or around 7.2 to 7.4 which means I have around 60 ppm of CO2, and that figures because my tetras were all up at the surface of the water earlier today.

I was injecting CO2 at around 1 bubble per second. Backed it off to 1 bubble every 2 seconds or so.

Please help me figure out what the hell is going on.

Update: A reply on APD says that CO2 can cause KH to go up. I hadn't heard that one before.

Regards,
Barry
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Last edited by banderbe; 02-04-2006 at 09:06 PM.
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post #2 of 6 (permalink) Old 02-04-2006, 07:23 PM
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My guess is that there is something in your tank raising your KH. What are you using for substate?
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post #3 of 6 (permalink) Old 02-04-2006, 07:31 PM Thread Starter
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Quote:
Originally Posted by emoore3
My guess is that there is something in your tank raising your KH. What are you using for substate?
Yeah, I figured something in the tank was making the KH go up.. but what?

My substrate is silica sand (about to change to EC), plus some fake plants, few pieces of drift wood.. that's it! ( I'm adding CO2 to get a feel for how much I need to achieve a given CO2 concentration, even though no live plants are in the tank- yet)

I suppose it's possible that silica sand is doing it but I have not read anything to support that and believe me I have been looking.

Regards,
Barry
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post #4 of 6 (permalink) Old 02-04-2006, 07:38 PM
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29 KH??? As in 500 ppm?
Or 29 ppm as in 1.6 degrees?

Maybe I don't know what I'm talking about since I get <1 KH from my tap but that sounds incredibly high. If what you have is actually silica sand it will not affect KH.

Fake plants? Oh, say it isn't so!
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post #5 of 6 (permalink) Old 02-04-2006, 07:45 PM Thread Starter
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Quote:
Originally Posted by guaiac_boy
29 KH??? As in 500 ppm?
Or 29 ppm as in 1.6 degrees?

Maybe I don't know what I'm talking about since I get <1 KH from my tap but that sounds incredibly high. If what you have is actually silica sand it will not affect KH.

Fake plants? Oh, say it isn't so!
According to Aquarium Pharmaceuticals KH test kit: 29 dKH!!! as in 516.2 PPM! I.e. it takes 29 drops to get the water to begin to turn yellow!

The silica sand is "blasting sand" from Home Depot. Bought it last summer before I decided to do a planted tank..

Regards,
Barry
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post #6 of 6 (permalink) Old 02-08-2006, 11:06 PM
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a bad test kit maybe?????
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