We have one by Kenetico. It is non electrical, put in a bag of salt and it has timers, backwashes and stuff. I know the seller of the house said her husband researched it so they would have something that didn't cost a lot. this one only requires salt, we have good soft water, now it doesn't treat impurities but we have city water. I have a filter before it that takes out any debris and chlorine, then our filter on our fridge treats all kinds of stuff from bacteria to cysts, but I also have a stand alone water dispenser and buy the big bottles of water for it for drinking though I do use the ice. I wonder how much sodium I'm getting beyond what I need though.