If you have a water softener, it's important to know how to read the meter that tells you how much salt is left in the unit. Most water softeners have a clear plastic tube that runs from the brine tank to the softener unit. The amount of salt in the brine tank is measured by the level of water in this tube. The more water there is, the more salt there is.
The other way to measure the amount of salt in your water softener is by looking at the gallons remaining on your unit. This will tell you how many gallons of softened water you have before you need to add more salt. It's important to keep an eye on this so you don't run out of softened water and end up with hard water again.