I've never done this and haven't had a need to, thankfully... I'm wondering though if you are trading a small amount of salt for some amount of potato starch and if so, what did it do to the product? Help to thicken or maybe leave a white residue in the bottle?
I've not noticed much if any thickening, and certainly no white residue in the bottle. Then again I haven't used many potatoes in any one batch before.