First off let’s look at the process of dropping ALK by Ben’s method. You use muratic acid to drop the pH witch in turn lowers the ALK then you use aeration to raise the pH back up and the ALK remains at the lower level. Aeration of the incoming water would increase your pH with out benefit of dropping the ALK witch I assume is your goal. I don’t think that aeration of the incoming water will help keep your ALK from rising when adding fill water unless you can acidify it before it is aerated.
D'oh! OK, I get it now. Thanks!