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Re: [APD] Flourish iron & KH drop

It's not organic acids.  As I said in the original post, I added 5ml of 
Flourish iron to 2L of tapwater & in 30 minutes the KH dropped from 10 
degrees to 7.5 degrees.  Nothing else added!

Anyway, I know the rate at which the KH drops in my 50g - I've been 
running it (& monitoring it) continuously since 1997.  It's definitely the 
Flourish iron which I've just started using.

At the moment I use Sodium Bicarbonate if I (rarely) have to adjust KH.  I 
don't want to add anything with Calcium in it because my GH is naturally 
very high.

I'd like to try using Potassium Bicarbonate (because I don't really want 
to add Sodium) but I can't find a supplier in the UK.

Regards, Kevin

>I'm suspecting that organic acids that form in the tank between water 
changes are taking >down the KH, and that it doesn't necessarily have a 
direct connection to the Flourish Iron.
>If I wanted to increase KH, I'd add calcium carbonate or baking soda, 
which I do with each >water change just because my tapwater has virtually 
no carbonates.
>----- Original Message ----
>>Kevin Buckley wrote:
>>This seems to have prompted responses concerning the value of pH 
>>controllers in CO2 systems!!
>>Regardless of that, it would seem to be undesirable to have a rapidly 
>>reducing KH (from 9deg --> ~2deg in just under 2 weeks).
>>Do those of you who use Flourish Iron compensate for this by some other 
>>Regards, Kevin
>>>I just started using Flourish iron &, after a while, I noticed that my
>>>plants had stopped pearling.
>>>I have injected CO2 & 330W of CF lighting in a 50g.
>>>I then noticed that, as I added a capful of Flourish iron, my pH 
>>>a little.
>>>I tested my KH & found that, over a period of several days, my KH had
>>>dropped from 160ppm to 50ppm.
>>>The reason the pearling had stopped was that my CO2 controller (set to 
>>>= 7.3) was no longer injecting CO2!!
>>>I added a few teaspoons of Sodium Bicarbonate to raise the KH & 
>>>everything returned to normal.
>>>I just did a quick test ...
>>>My tapwater has a KH of 180ppm.  I added 5ml of Flourish iron to 2L of
>>>tapwater & waited 30m.
>>>The KH had dropped to 140ppm.
>>>Has anyone else had this problem?
>>>Regards, Kevin
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