[QUOTE=Spar]At ACA this year the Seachem rep was explaining to me the difference between using Chelated Iron verse using Flourish Iron. Basically, if I remember correctly, he was saying that Chelated Iron must be absorbed by the roots of the plants, while regular un-chelated iron (i.e. Flourish Iron) can be absorbed through the plant itself (not just the roots), providing quicker and more efficient dosing responses.[quote]
No, that is simply not true.
Here's the deal, GW iron=> ETDA chelator
SeaChem Flourish Iron=> Gluconate chelator.
The difference? One is a strong chelator, the ETDA, and the other is a weaker chelator(Gluconate).
How does this help plants? They need less energy to unchelate the gluconate before taking it in the pl;ant's internal organs: leaves, roots etc.
But........iron is a trace lement, so not much energy is lost and the iorn is left in solution longer before preciptating out using ETDA, but it's still a trace so a small dose of Flourish Iron every 2-3 days will dop the same as a residual dose of ETDA iron.
The differences are extremely subtle at best.
All plants remove the Fe and leaves the chelator outside. In other words, they never taker the chelator internally into the plant.
Plants have their own set of chelators they use once inside the plant.
DTPH is another decent chelator, Tropica Master Grow uses this.
I'm a bit partical to TMG, but do use SeaChem Flourish often.
I do not use Flourish Iron, if you need etra iron, go ahead and add the other traces as well, stick with Flourish since it has everything.
Greg Morin I've known for many years.