Aptus Fasilitor is the best monosilicic acid on the market in my opinion.
Fasilitor is the product that kicked off this whole silica craze to begin with... It was the first stabilized form of monosilicic acid to hit the market and dozens of companies have since released similar products trying to cash in on the craze.
Here's why
Fasilitor is the best silicic acid on the market: Due to the nature of silicic acid, it is very difficult to stabilize in a concentrated liquid form. Because
Aptus was the first to do this, they basically chose the best stabilization method and patented it. So every other company that has since come out with a silicic acid product are simply using inferior stabilization methods. PowerSi for instance uses phosphoric acid to stabilize it's product which causes it to become less bio-available over time and also adds unnecessary levels of phosphorus into your media.
Fasilitor has neither of those problems due to their proprietary stabilization method.
I use
Fasilitor at 0.5ml per gallon every watering from week 1 of veg all the way to flush.