wrote:
Hi,

I found this:

http://www.petsolutions.com/Natural+...-10143-C-.aspx

What is your opinion on this product?
Does it really replace a (diy)co2 system?

Well, it's mentioned on the krib:
http://www.thekrib.com/Plants/Fertil...ake-oil.html#1

I'm not able to find a definitive answer on ingredients, and the
purported manufacturer's website (http://www.marcweissco.com/) doesn't
even list it as a product anymore. Caveat emptor.