I have done more research than I care to admit on some of these nutrients and the shit the companies put on labels and most are completely lying on the labels. When you see something like Guaranteed Minimum Analysis that means nothing really. A big company like Jacks or Masterblend is pretty accurate about the actual products in the bag. Some of the other manufacturers do some really bad things. I know one company that posts Magnesium at half of what is in the mix, this same company uses calcium nitrate in their blend but they also add the micro nutrients to the calcium Nitrate to make you pay 100 dollars for the calcium Nitrate over 40 bucks for a 50 pound bag of green house grade calcium Nitrate. The best Monosilic Acid I have used is cilicium but the stuff is too expensive, I saw an paper by a well known hydroponic expert and he sort of explained that they are doing. See the boron in the label above that has to be there to keep the Monosilic Acid stable. More than likely Cilicium is adding extra boron because the plant likes it. They all do crappy stuff like this but the only way to really know what is in the stuff is to have it lab tested.I was looking at this earlier. I think Bill suggested as an alternative to Grow Genius and PowerSI
Looks to be about $30 for 250ml.
I will look at FrontRow a little more, seen it in my browsing.
GUARANTEED MINIMUM ANALYSIS
Available Silicon (Si(OH)4) .......... 44.0%
Boron (B)(actual) .......... 0.009%
Molybdenum (Mo)(actual) .......... 0.0015%