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I've been reading about the benefits of using silica. Sounds like it is needed for hydroponics but is it necessary for soil grows?

I have recently purchased a reverse osmosis system. Before I installed the ro system my tap water was at 8.5ph. Now I can't get a stable reading of what the ph is at. I've heard that ro won't change the ph of your water just the purity. My question is do I still need to ph my water when...

Thanks sanvanalona for the reply. Great information.

It seems like a lot of people use about half of the recommended dosage for their nutrients. I'm using Botanicare Pro Veg and Pro Bloom and was wondering what dosage people have had good results with.

Should I ph my water before or after adding the nutrient solution?