How are you getting close enough to your grey water to smell it? Just curious.. Maybe I'm missing something. Even at the dump station, I don't smell anything from either tank... not that I'm sticking my nose in the hose or anything..just my curiosity..
But yeah, you can use the same bio paks for your grey tank that many use in their black one.
2016 27BHS Elite
2012 F-150 EcoBoost / Max Tow (Sale Pending)
2017 F-250 Lariat (Factory Ordered on 4/20)