1. Reset the level - the salt level needs to be reset on the control panel every time new salt is added to the tank. For instructions, visit our Salt Level Programming article.
2. Check for salt solidification - if your 'low salt light' is flashing with plenty of salt in the tank, it's likely some salt has solidified near the bottom. Your softener is still going through recharges, but is having a tough time dissolving salt properly.
Using a broomstick handle (or other rounded tool), push the tool into the salt in a few different places. If you can only push down a few inches, please visit our Salt Bridge article for some quick troubleshooting steps.