Sorry it took me so long to see this thread. I must have missed the email telling me it was posted .
Yes you can mix them. there isn't really a ratio , more so that you use the typical suggested amount of each. Yes, the carbon will not last as long so you do waste some of the GFO. This typically more of a big deal if you purchase GFO at retail prices but at our prices many people don't spend a lot of time worrying about the couple bucks. Its a trade off I guess, $ or ease of use.
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