Just make sure that after you fill it with new sand, you start the pump back up with the filter handle in "backwash" mode, let it backwash for a minute or two, then turn pump off, turn to rinse, let it rinse for a minute or so, THEN back to filter. If you don't, then all the dust from the sand will blow back into your pool, and create another week's worth of work to clean up--been there, done that!!

Janet