Question about adding co2 - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 11-08-2005, 03:07 PM Thread Starter
Planted Member
 
PTrader: (0/0%)
Join Date: Jul 2005
Location: Saint John, New Brunswick
Posts: 264
Question about adding co2

Hi,


I understand that co2 decreases ph.
Does it also affect KH? Can someone explain how?

Is the ph decrease gradual?

My ph is usually 7.8 and kh 220.
I finally got my diy co2 going last night, and this morning ph was at 7.4.

Will it still decrease?
HammerJoe is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 11-08-2005, 04:06 PM
Wannabe Guru
 
Spar's Avatar
 
PTrader: (3/100%)
Join Date: Aug 2003
Location: Dallas
Posts: 1,018
it will not affect KH.

the pH decrease from co2 injection is gradual to the extent that it take some time for the water to become saturated with co2. You will hit a peak point at some point (a few hours into the injection) to where your pH and co2 will level off.

with DIY, you will have fluctuations throughout the day and night since you can't control the output. So it may decrease more at some points and may increase at some points. no way to tell. just know that fish don't react to these pH swings, so don't let that worry you.

Cliff
450g Planted Discus Tank - Work in Process!
Spar is offline  
post #3 of 4 (permalink) Old 11-08-2005, 09:37 PM
Wannabe Guru
 
jart's Avatar
 
PTrader: (0/0%)
Join Date: Jan 2003
Location: NS Canada
Posts: 1,401
Spar, can CO2 not indirectly affect kH? Suppose you had crushed coral in your filter. Would the decrease in pH (via the CO2) not increase the rate that the coral dissolves, thus (indirectly) increasing the kH? However, if this is the case, one might expect the kH to stabilize after a few days anyway.
jart is offline  
 
post #4 of 4 (permalink) Old 11-08-2005, 10:25 PM
Wannabe Guru
 
Spar's Avatar
 
PTrader: (3/100%)
Join Date: Aug 2003
Location: Dallas
Posts: 1,018
Quote:
Originally Posted by jart
Spar, can CO2 not indirectly affect kH? Suppose you had crushed coral in your filter. Would the decrease in pH (via the CO2) not increase the rate that the coral dissolves, thus (indirectly) increasing the kH? However, if this is the case, one might expect the kH to stabilize after a few days anyway.
yep, you are correct. indirectly it could. some people have calcium reactor chambers that do exactly what you said, using co2 to help dissolve CC and thick calcium concentrations faster.

I am willing to bet that co2 has other affects on KH as well, just as Tanics aid in lowering KH slightly as well (adding H+ ions or some effect that I know nothing about ). However, I have not witnessed enough of a KH effect on my 45ppm co2 water to say that it will be noticeable.

Cliff
450g Planted Discus Tank - Work in Process!
Spar is offline  
Reply

Tags
None

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome