It is possible but not simple. For one the very small size of the skimmer will limit the reaction so it won't be terribly efficient. You would need to have the older version of the silencer, a small airpump (50l/hr) and a T. The air pump would pump to the T right before the ozonizer, this will let excess pressure bleed off and not pressurize the skimmer, generally it would be preferred to have the T after the ozonizer but venting ozone into the air directly is not the best idea, you would need to play with this and put a carbon filter on the vent if the T goes after the ozonizer The air hose would then connect to the old style silencer.