Reducing pH and buffering to7.0 - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 11-15-2006, 03:17 AM Thread Starter
PTrader: (0/0%)
Join Date: Nov 2006
Posts: 3
Reducing pH and buffering to7.0

New to the forum but already impressed; just can't find what I need in published posts. A bit "out of left field", for my "tank" is a 38,000L (~8000 gal) pond, without fish yet but plenty of water plants: still trying to get the water stable.
Water constantly recirculated through water falls, ozone clarifier & filter but pH is 8.8 and alkalinity is 180 ppm (Is that about 10 KH?) QUESTION: How can I reduce pH and buffer to between 6.5 & 7.0? (RO is out of the question for this size.)
CharlesfromOz is offline  
Sponsored Links
post #2 of 5 (permalink) Old 11-15-2006, 03:39 AM
Planted Tank Enthusiast
Lycosa's Avatar
PTrader: (8/100%)
Join Date: Oct 2006
Location: Florida
Posts: 572
I would question your ozone system. As organics are oxidized, your pH can jump considerably. If you are running the system 24/7, I would recommend you back off a little and then check your pH. If you are not running the ozone system with a redox meter, then I suggest that you get one or at least try and lessen the run time of the system and see if that changes anything.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Interested in Science? Want to learn more about what's happening inside your aquarium? Join SEAR and get started. PM for more details!
Lycosa is offline  
post #3 of 5 (permalink) Old 11-15-2006, 04:33 AM
Planted Tank Guru
Rex Grigg's Avatar
PTrader: (65/100%)
Join Date: Dec 2002
Location: Portland Orygun
Posts: 9,600
That pH is high for that amount of kH. Something else is affecting the water chemistry. I would guess that your source water is pretty much the same as the pond. Only problem is that when water evaporates from the pond you add more source water. Of course the kH stays in the pond.

Are you by chance using test strips to determine the water parameters?
Rex Grigg is offline  
post #4 of 5 (permalink) Old 11-15-2006, 08:54 AM Thread Starter
PTrader: (0/0%)
Join Date: Nov 2006
Posts: 3
Lycosa, thanks for suggestion. I have previously been advised the ozone, which is applied in a separate tank as water is circulated, will treat the water and will revert to oxygen, but I will try as you suggest.
CharlesfromOz is offline  
post #5 of 5 (permalink) Old 11-15-2006, 09:01 AM Thread Starter
PTrader: (0/0%)
Join Date: Nov 2006
Posts: 3
Thanks Rex Grigg. Source water is a "bore" (I believe you call it a well) with pH 7.6. An extra factor is I draw from the pond to irrigate my gardens (about 500 gal/day) so expect some of the KH is extracted with the irrigation.
(Testing is by titration for KH)
CharlesfromOz is offline  


Quick Reply

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


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

Email Address:


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