Gravity eh. Ill check into that. Im in Canada so i hope we have it. I have also seen things called Ton_o_)Bud its looks like blue crystals..,... is this the same type of product a crystaline type substance?

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Hydro Drip System Cheese and Strawberry

http://www.rollitup.org/grow-journals/183152-first-time-top-feed-dripper.html