What are you trying to do?
If 'aerating' is to remove chlorine, that will work. If you are trying to remove Chloramine (some cities use this instead), that will not work.
Chloramine (derivative) is a key ingredient in DM Zone.
If you want to remove chloramine, Prime or AmQuell (from the fish store) will break the chloramine bond (ammonia and chlorine).
Most use RO to get as near 0ppm water as possible by removing the ~other~ things that are in the water, not just chlorine/chloramine. Check your local water supply website for analysis to see whats in there.
My tap is ~170ppm. I run it through a whole house filter (Not RO) and it gets down to ~110-120ppm. Good enough for me...