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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.<snip>
>So how much are you using?
>Seachem recommend dosing at 0.5 to 1 ml per 40 litres as required in
>order to maintain iron levels at 0.1 mg/l.
>You've got a 50 gallon = 200 litre tank. Are you dosing 500 ml of
>Flourish Iron in your tank each time, because that's the equivalent
>to what you're adding to your 2 l sample.
>Your test uses an absolutely massive dose and the EDTA in the product
>may well be doing something with the carbonates in the water when
>added at those concentrations. The question isn't what the product
>does at those concentrations. It's what does it do at the
>concentrations you dose your tank at.
>You've got a 50 gallon tank. That's 200 litres. You're using a 2
>litre sample. Divide the normal dose you give your tank by 100, add
>that to a 2 L sample of water, and see what that does. If that causes
>the KH to drop, then maybe your test is giving you the answer to why
>your KH is dropping, but if a test using the same concentration of
>Flourish Iron in a 2 l sample that you actually dose your tank with
>doesn't cause the KH to drop then you probably need to look elsewhere
>for your answer.
I was all set to respond and then I saw this post
from David Aiken which succinctly makes the point
I would have otherwise made. Flourish Iron does
have an acidic pH as formulated (for product
stability) however it is weakly buffered enough
that it should not have a significant impact when
used as directed... which begs the question of
what your current dosing regimen is, i.e. how
much in what volume and how often?
What I would add here is that the acidity level
employed in the product, (when used as directed-1
mL in 40 L) would only consume 0.004 meq/L (or
0.012 dKH or 0.22 ppm) of carbonate alkalinity at
a theoretical maximum, in practice it should be
well below even that small amount. To get the KH
drop of 160 to 50 ppm you saw would imply a 500
times overdose over the recommended usage.
Also, as an aside... Flourish Iron does not employ EDTA.
Gregory Morin, Ph.D. ~~~~~~~Chairman/CEO~~~~~~~~~~~~~~
Seachem Laboratories, Inc. www.seachem.com 888-SEACHEM
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