Basically What you are doing is rinsing it clean , The sand rite out the bag when U add watter to it will cloud up/Dirty sand Mud if U will .... What I do is get a home depot bucket fill it 1/3 with the sand then its off to the bath tub rinsing it over and over and over and over and over and over and over Well you get the point , Eventual when you rinse the sand "CLEAN" the sand will settle in the bucket leaving behind clear clean watter on the top of the sand ...
Agitating it with your hand/string the pot will help Good luck . I say it take about 30min+ to clean 50lbs but for the price its like a sore peter you cant beat it ..