Sensors and systems for monitoring salt levels in water softeners and water softening systems; sensors and systems for monitoring salt levels in water treatment systems; electric or electronic devices and systems for detecting low salt levels in water softening systems and water treatment systems; monitoring devices and systems for detecting low salt levels in water softening systems and water treatment systems; low salt alert systems for use with water softening systems and water treatment systems; wireless remote salt level detectors and systems for use in water softening systems and water treatment systems; salt level sensors, detectors, monitors and alarms for use in water softening systems and water treatment systems; sensors and systems for monitoring the level of salt in water softener brine tanks; electric or electronic devices and systems for detecting low salt levels in water softener brine tanks; alarm sensors and detectors for detecting low salt levels in water softener brine tanks; wireless remote monitors for monitoring the level of salt in water softener brine tanks; and electronic devices and systems that detect or sense the level of salt in a water softening or treatment system and wirelessly send a communication message alerting a user that the water softening or treatment system is low on salt