@Newt, @SilvaBack203, @Graysin, @VirginiaGrowBoy, @Sydious, @Retiredoldguy -
I’ve bought GH Armour Si and Mr. Fulvic to begin adding to my grow. I know to add Si first, but am not sure on the fulvic. And should I begin at 100% recommended rates or half?
I’m looking for any advice.
I don’t use Jack’s, so not sure I can answer. But in general, I follow the manufacturer’s recommendations.
You shouldn’t have any issues with full strength with fulvic or silica, but do recognize that fulvic will increase nutrient uptake and may lead to a little nute burn if overdone.
I have never paid attention to mixing order other than to recognize that silica highly alkaline and can be used to increase the pH value of other solutions. I have never used fulvic and can’t comment on its impact on pH. I use microbe products to accomplish what fulvic does.
I don’t use Mr. Fulvic so no knowledge for you on that one…I do use Si and I always mixed it first in my distilled water nutrient base and I currently use half the recommended amount
In my mind Fulvic falls into the same category as microbes which are typically added last. Some microbe mixes have it in there along with Humic acid. So I would add last and then check pH.
But I could be wrong…That’s what my wife tells me all the time.
This is how I did it, too, more or less. Not saying it’s right, but it seems fine.
Silica → Part A → Epsom → part b → Fulvic → pH adjust → microbes.
I use armor si and Mr fulvic mix the armor si before the jacks then I add my Mr fulvic I use it through veg and into flower through harvest as the directions say I use one ml per gallon I personally like the product think it is a very good product I’ve been using it for about a year and a half now 
I don’t use fulvic but do use Si. I was using the same Si as you (GH Armor Si) and recommended using 4ml/gal.
Thank you everyone. My fulvic just arrived and today is feed day. Time to try them out!