If size really matters, then this is the ideal choice for condos, apartments, even RV’s..KENT Mini Water Softener converts hard water into soft water by replacing hard salts like Calcium and Magnesium with Sodium through an efficient ion exchange process. This is done with the help of high quality resin beads that are charged with sodium salts, which attract hard salts and convert them into soft salts..Mini Twin Water Softener w Autotrol Timer Valve $. When you are fore, this mini water softener is the way to go. Twin tanks “x”. A great water softener for mobile homes, motor homes or small homes with limited installation area. Fits in the smallest of closets or cupboards..The Mini Water Softeners from Watts can be used for commercial tea or espresso machines and steamers or as a pretreatment for small reverse osmosis units for the home and office. The K and K mini water softeners eliminate the problems caused by hard water on tea and espresso equipment, and greatly enhance the quality of the finished product..