bloads
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Well hold on now if it raises pH there might be some actual value here - especially since you get that smallish dose of potash with it . . .
All that rep on your avatar there Venom surely you can ballpark this - if you mixed a batch of nutes @ 1000ppm that mixed up to a ph of 4 (I'm thinking of Botanicare base nutes here) - and added 5ml/gallon of silica - where would the pH be?
Of the two different silicas I've used, one seems about 4x stronger than the other (Mad Farmer > Botanicare), so it's hard to say.