[villagetinker]

Originally Posted by dbussone

Most filtration systems can take either sodium or potassium. I'd check your manual to see what is recommended. If you have a choice, use potassium. Sodium has some potential side effects on your health.

Update. Just checked online: use potassium.

Pegasus Water Systems | Built Specifically for Treating Florida Water

We have a Sears system, water softener (uses salt), and a whole house filter. I have a chemical test set (from the local pet store) to test for chlorine, SALT, and other chemicals. With this system, I have never detected or tasted any salt in the filtered water. While I understand the concerns of high sodium in water and the associated health concerns, IMHO, a properly operating system will not add a significant amount of sodium.
If your system can use potassium, then use it, NOTE, it is more expensive then salt.