Usually, guides and instructional E-books, regardless of what they cover, are very biased towards one of the ends of the experience spectrum: they're either aimed at newbies or at pros and there's little leverage in between. In the field of hydroponics, if you're slightly experience but still not worthy of considering yourself a professional, you'll be hard pressed to find a guide that's suitable for your skill level, because of the problem I mentioned above. I was in this tough spot and I was almost ready to give up on trying, until I found the Hydroponics Garden E-Book.
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