You can use any of their additives- PK Apatite, Ruby Fulvic and Decision 1/4 strength as a foliar. Just make sure you do it right before or when the lights go out.
There's been a lot of buzz about this line recently. Beau the owner is a smart dude. It's interesting how they broke the different phases down by seasons.
I also think Silicium is their product, but it is neither on their or their distributor's website.