Dissolve it in warm water, then pour off the water, then let it evaporate. Sand won't dissolve in warm water. Ketamine will.
Oh right yeah I understand, thankyou. Would the easiest way to be to filter the sand out by eye just slowly pouring the water into a cup? Also, is there a way of hurrying up the process? Maybe placing the water into a bowl and putting it above a hot stove?