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Re: [APD] CO2 and pH control



It's a new probe that was calibrated a week ago and it's readings 
correspond with 2 separate color tests.

Gordon

Laith Arif wrote:

>When was the last time you calibrated your pH probe?  Try to use another
>method to test your pH to double check it.
>
>Laith
>
>
>-----Original Message-----
>From: Gordon and Susan Watkins [mailto:gwatkins at ritternet_com] 
>Sent: 12 December 2005 19:38
>To: aquatic plants digest
>Subject: Re: [APD] CO2 and pH control
>
>My resting tap water now shows 8.6. I'm not sure why I previously tested 
>at 9.3. My tank has a laterite sublayer with "inert" aquarium gravel on 
>top. Decorations are petrified wood. Trickle filter has a floss 
>prefilter and bioballs.
>
>Jerry Baker wrote:
>
>  
>
>>Gordon and Susan Watkins wrote:
>> 
>>
>>    
>>
>>>The pH reading is coming from the sump of my trickle filter using a 
>>>Milwaukee controller. Right now, with CO2 running, it shows 8.1. I 
>>>checked another tank which has been set up continuously for over 25 
>>>years and, using the same electrode, it showed 8.9. What else could 
>>>account for the discrepancy?
>>>   
>>>
>>>      
>>>
>>You could have gravel or decorations which are buffering your pH. Things 
>>like shells, coral, limestone, marble, etc. will do that.
>>
>>I intended to ask what is the pH of the tap water after it has sat out 
>>for awhile (not in an aquarium).
>>
>> 
>>
>>    
>>
>
>
>
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>  
>
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