Our technology affords salt-free water softening and simultaneous, tunable TDS removal (deionization) for residences, from apartments to larger homes. CapDI can be used as a point of entry (POE) water treatment system in larger residential projects, such as apartment complexes, hotels, and residential neighborhoods. A single system can be used to deliver treated water to up to 100 apartments at once. The anti-scaling effect is helpful for the longevity of all residential appliances, and CapDI systems produce high quality drinking water with better health benefits. Years of development have resulted in a market-ready, revolutionary POE whole-home water softening system.