Remember to watch the sand really nice, what i did with mine was put 1/3 of sand in the bucket and put the hose in it, open the hose and start moving the sand that way small floating particles will float and go out of the bucket, keep moving once for some time and let the hose open dropping water over the borders of the bucket, when you can see crystal clear water move the sand again and do this until there are no floating particles, this way you will have clean heavy sand that will go to the bottom as soon as you drop it.