I just put it in the bucket I use for my tanks, fill part way with water, agitate to kick up the crud, and pour out the water while being careful to not pour out too much sand. Repeat until water comes out clear. The sand comes with a packet of stuff to help clear the water - I used it once with no noticeable results.
Dunno if it helps or not, but I've found that about 5-8lbs gives about a 1" deep layer in a standard 5 gallon aquarium, and a 20lbs bag yields a 1-1.5" layer in a tank with a 12"x24" footprint.
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