Water Softners

When buying a new water softener, selecting one that is the right size is important. You'll want to get one that can handle the demands of your household but is not unnecessarily large (and expensive). Physical size isn't the issue--the unit's ability to remove "hardness" minerals from water without frequent regeneration is.
For More: http://www.hometips.com/buying-guides/water-softeners-sizes.html