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6,057 Posts
+1
A little oily film is normal and it doesnt really transfer to the tank as long as you rinse it well.
For me it takes 4-5 rinsings, and it's easier if you dont try to do too much at one time. In a 5 gal bucket I fill about 1/4 the way up with sand. Add water til the bucket is 75% full or so, and stir the crap out of it. Pour off the excess water and repeat 4-5 times until the water becomes mostly clear.
Then dont worry about it.
