When we use carefresh, to dust it out, we move the tank out of the room it's kept in and either I hold the snake, or my boyfriend holds the snake and the other turns a fan to blow into the tank and then we spend about an hour shaking and agitating the carefresh until we're satisfied with the amount of dust that's flown out and covered our hand/arm/clothes/blankets we do this on/anything around. We trade off dusting and holding snakes when our arms get tired. Then we let the tank sit for about 10 minutes, then we shake it again with the fan on it and if any dust comes up, we shake it for as long as it takes to get the dust out until we're satisfied that we've dusted it.