I recently installed a water softener and having a fair amount of clear iron in our water, I've been using Morton Rust Remover pellets which are basically NaCl with citric acid added as an additive. I'm guessing the iron removal function has something to do with the citric acid since it's the only notable difference between this salt and regular water softener salt.
At some point I'd like to stop using NaCl and switch the KCl since it seems to be more environmentally friendly. However, I really notice a difference using the iron removal pellets and I've been unable to find an equivalent product for sale which uses potassium.
Can I simply mix some citric acid in with the potassium in the water softener to achieve the same result? Or do the citric acid and the sodium have some special relationship which helps with the iron removal?