SLM-010 is Bluetooth Water Softener Salt Monitor unit. SLM-010 communicates with iPhone or iPad and short-range LiDAR module TF-Luna A01. The iPhone (iPAD) application continuously receives salt level data and operational status and indicates them in real time. iPhone application also, produce visual and sound alarm with text message (if it is set) in case if salt level is less than 40% and second message if salt level is less than 30%.