ACV is good for correcting porosity problems. Here is a website that talks about acidic conditioners (which is probably roux porosity control) and acidic rinses (like ACV) for porosity control. Since they both do the same thing I'd probably stick with the cheaper option (which is most likely the acv, lol)
P.S. I like that the site brought out a benefit of porous hair. It absorbs lots of water, like a sponge. But it's hard for it to retain it and that's why it's good to do use acidic conditioners or use vinegar rinses because they temporarily seal your cuticle (until your next wash), allowing you to retain the moisture your hair absorbed.
http://www.associatedcontent.com/article/375435/hair_porosity_help_for_dry_damaged.html?cat=69 (check out the third page).