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Re: [APD] Flourish iron & KH drop
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.
sh
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----- Original Message ----
From: Kevin_Buckley at uk.neceur.com
To: aquatic-plants at actwin_com
Sent: Thursday, March 23, 2006 1:27:24 PM
Subject: Re: [APD] Flourish iron & KH drop
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
means?
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 dropped
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 pH
= 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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