Sounds to good to be true, eh?
You know what they say about that.
That might work to keep any water soaked into netting(I'm assuming 'cloth' rather than metal mesh) from freezing, but I seriously doubt it will keep snow from sticking to it, especially if the temps is below 10°F, when salt stops being effective.
Plus the salt may speed the degradation of the netting as it's very corrosive.
Give it a try, let us know how it works...but I'd be ready with some 2x2's 8' long with a slot cut in one end to prop that netting up when it starts to sag.