After listening to all of the reviews as well as trying one of these I liked the basic premise of the idea. So, I bought a bag of Kingsford charcoal for $8. I crushed it up and poured it into cheesecloth bags as well as open containers and even poured some into the air filter for the heat/air system.
The charcoal worked great! So charcoal works fine if you use lots of it. I tried the same thing using Baking Soda and that worked well also. I poured it into every drain then added a touch of vinegar and it cleaned all of the drains and they too smelled fresh.
Bottom Line: Yes, I would recommend this to a friend
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