A fleck water softener is a type of water softening system that uses a process called ion exchange to remove minerals such as calcium and magnesium from hard water. The system works by passing the hard water through a tank filled with resin beads. The beads are coated with sodium ions, which attract and bind to the calcium and magnesium ions in the water. The softened water is then passed through a separate tank containing a brine solution, which recharges the resin beads with sodium ions, allowing the process to be repeated. Fleck water softeners are popular because they are relatively easy to install and maintain, and they are effective at removing hard minerals from water.