I have a T-fitting in my Venturi intake hose. In this picture the ozone tube is not attached, but I have it plumbed into the intake.
The bag of carbon sits on, or is adapted around, the adjustable output tube where the water is released.
Also the small ozonizers units (100mg/hr) that are made for the hobby have little if any risk. I do not have carbon on my out put tube and have had no problems.
I can get better pictures when I get home from the office, if you would like to see more.