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Hi, I am a new grower =) . (some back ground) I did all my research etc. I found a good place to buy RO water, 2 bucks for 19.9L a pop. I am using a 20L pale for my veg reservoir. Well, I had bought well over 1k worth of equipment .. but for the life of me, no one had ph up! Anyhow, the Ro...