I've seen charcoal filters at home depot. I've also read about people making their own. Charcoal filters seem like a pretty easy thing to get your hands on.

Ppm? Don't you wanna get a pH pen?

I think it's also important to realize what connieseur said about micro-nutrients and stuff. You can't just solely use guano tea from propagation to harvest (although that would probably make some damn delicious tasting bud) you might have problems with just guano.

Another really good resource from the organic grow master (soma)
http://www.somaseeds.nl/magazine_art...withGuano.html

If you wanna stay hydro-organic Fox Farm makes a really great Hydroponic 100% organic vegetative fertilzer (Grow Big)
Buddahbear Reviewed by Buddahbear on . Organic Nutrients? I was thinking about using bat guano as the only nutrient in my DWC system. it is an 18 gal rubbermaid housing 2 plants in 3" net pots filled with hydroton. I was planning on using the mexican bat guano for the veg stage (10-2-1) and then using either the jamaican (1-10-0.2) or the indonessian (0.5-12-0.2) Do you think this would work? It will certainly be a whole lot cheaper. I am thinking of doing it just as an experiment. Please jot down your opinion, for the first timer. Peace. Rating: 5