Sherry, We live on a forested acerage and have the hardest, most ornery water imaginable. We have to soften and the sodium was causing a lot of damage to the trees and forest undergrowth. We have switched to potassium softening but I'm looking for information on the residues formed by softening with potassium and the effect on plant life. So far the only info I have found on potassium and plant growth relates to potash fertilizers. This is very different than what would be formed by softening effluent. Any ideas on where to look for info? D Renneberg PS. We had the same solid forming happen with the use of Sodium based products, so I don't beleive that it is exclusive to the type of salt used.