Originally Posted by BeerHere
.....One question: What does sparge mean?
Sparging is the process of rinsing the fermentable sugars from the mash and collecting wort for the boil. After the mash and before the boil, the newly created wort must be separated from the mash. This process is known as sparging or lautering. The objectives of sparging are to collect as much sugar from the mash as possible while leaving behind as many undesirable compounds as possible, and to make the wort as clear as possible by trapping dust and husk particles called draff in the grain bed itself.
This is usually done by either batch or fly sparging. And they both involve washing/rinsing the grains with clean hot water (170F- 175F). This in turn extracts the rest of the sugars so that all is used for the wort. I wish I knew how to post links to help more. But if you use Google or any other search engine you can find it. Find John Palmers book, it's on a website called www.howtobrew.com
It's a great resource.