The National Science Foundation (NSF) awarded a $275,000 SBIR Phase I grant under the NSF Technology, Innovation, and Partnerships (TIP) program (CFDA 47.084) to Waterus LLC, a for-profit organization based in Irmo, SC. The goal of this project is to develop an innovative, environmentally-friendly solution for softening hard water without the use of salts. The proposed technology utilizes a novel electrochemical process based on redox flow cell technology to selectively remove calcium and magnesium ions from water, addressing the limitations of current water softening systems. The research aims to achieve a softening capacity suitable for the average American household, ensure water safety standards, and demonstrate long-term durability and cost-effectiveness of the system. The project introduces a significant technical innovation in the field of water treatment and has the potential to provide millions of U.S. citizens with access to soft water, thereby improving quality of life, reducing household expenses, and contributing to the preservation of natural water resources.