zebracake said:

The maximum recommended ppm for Si02 is about 100 ppm so as long as you don't go over that it should be fine. You should only need one source of it tho. Potassium silicate is the best source for silica according to this chart.

Plant Available Silicon, Soluble Silicon In Fertilizer Sources, Aafpco Approved Method

The chart that follows was taken from the above link and then I added the OSA/28, Fasilitor and Agsil 16h results to it. take it for what it is worth. you can add Permagard fresh water diatomaceous earth (fossil shell flour)to the chart at ~41% total Si and 0.23% soluble Si.

www.thcfarmer.com

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