Quote Originally Posted by davidstcldfl
Just my 2 cents....in my home system I used sea salt, at a rate of a < 1/2 ppt. I don't know if the 'extra' minerals, sea salt is supposed to have, helped any ...but my plants seemed to really grow well and I never had any sick fish.
Yes, common table salt contains sodium and the plants will take that in place of potassium, which is what they are commonly most deficient in, in an aquaponic system. They will also appear more succulent.

When people talk about adding salt to a tank, they are talking about sodium chloride or common table salt. I believe keith is making reference to additives found in different salt products, but the "salt" part of anything used is sodium chloride.