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Re: [APD] Flourish iron & KH drop

On 24/03/2006, at 7:38 AM, Kevin_Buckley at uk.neceur.com wrote:

> 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.

David Aiken
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Aquatic-Plants at actwin_com