I've had a few people asking me where to get Utah Sand and how to clean it. I've only done it once but I thought I would share how I did it and maybe somebody can suggest better ways.
This link shows has some great information about the sand:
http://www.utahreefs.com/forum/forum_posts.asp?TID=9244
This is page 2 of the topic and it has GPS coordinates:
http://www.utahreefs.com/forum/forum_posts.asp?TID=9244&PN=2
To sift the sand I just built a small box out of 2x4s and used a window screen:

To clean the sand I used an under the bed storage tub from Walmart. 41Qt 34 3/4" x 16 1/2" x 6".

I then used a garden hose sprayer to spray the sand. I sprayed using back and forth motions over the entire length of the tub.

Once the tub was full of water I would lift up one end of the tub to dump the water out. The sand would stay in the bottom of the tub. I repeated this rinse and dump a total of 4 times.

Dirty Water after 1st rinse:

Dirty Water after 2nd rinse:

Dirty Water after 3rd rinse:

Dirty Water after 4th rinse:

You know have clean sand:

I hope this helps.
If anybody else has different ways please tells us and let us know how it worked!
-Rocks