That's certainly what the instructions say, but after talking with Justin at Avast, apparently the preferred method is to reverse it now.
I've always injected ozone directly into a protein skimmer. Mistakenly was trying to equate the ozone reactor to a FW CO2 reactor where all of the injected gas is dissolved in effluent. Here both the ozone and carbon reactors are supposed to 'burp' for lack of a more technical term.
Few more pieces arriving over the next two weeks, but hope to have the new sump up and running soon. Will post more videos then.
Interesting you caught the routing. Thought for sure someone would call me out on the JACO fittings not being ozone compatible, put they are Kynar. Little concerned about the LLDPE tubing (it only has a 'fair' rating for ozone resistance), but I'll see how it performs and am ready with some Kynar barbed fittings and silicon tubing if necessary.
Appreciate the sharp eyes and heads-up!
Mike