Reducing pH and buffering to7.0 - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 11-15-2006, 03:17 AM Thread Starter
 
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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.)
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post #2 of 5 (permalink) Old 11-15-2006, 03:39 AM
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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.


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post #3 of 5 (permalink) Old 11-15-2006, 04:33 AM
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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?
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post #4 of 5 (permalink) Old 11-15-2006, 08:54 AM Thread Starter
 
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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.
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post #5 of 5 (permalink) Old 11-15-2006, 09:01 AM Thread Starter
 
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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)
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