Yes, I have my ozone plugged into the additional ozone intake. This is what Ozotech (who I believe know their stuff too) said about this particular skimmer model:
“the injector pulls from the silencer and the ozone line at the same time, however, the air will be drawn from the path of least resistance. This will usually be the silencer, especially if you are using the check valve on the ozone outlet line. If you have increased your air flow through the silencer, this would be why your ORP is not climbing.”
What this means is that the amount of ozone generated by the ozone generator needs to be higher than actually needed, which is not a big deal but I had some issues with this in the beginning, but just set the generator higher. They created a manual workaround to this issue which I can post somewhere if anyone needs this information.
Regarding the Deltec - the comparable model to the 220 INT should be the 2000i, and I believe they will have /already have models with an external pump.