Buddahbear.

Aight bro thanks, I figured using guano would be cool. So like connisuer said the only thing with guano is that my PH would be shifting a lot?

That pen has it all in one, thats gnarly. I found a ppm pen for $20 and thought I would get that for now, and continue to use the vile and drop tester kit. Its kinda prehistoric however this is a entry level. However the pen you showed me is on the "to get list" lol.

Do you have any ideas on how to make a carbon filter? I saw someone make one using the carbon that you can buy at a pet store. Any thoughts?

Thanks for the advice, keep it coming.

Respect.
G_V

*Anything I post on this site is purely hypothetical, I do not grow anything illegal, nor do I condone any such actions.*