I added some DE to my sand filter yesterday as outlined in the sticky at the top of this forum. (btw - the difference in my water overnight is AMAZING! )

When I picked up the DE at our local pool supply store, the older gentleman that runs the place told me that if I used the DE in the sand filter I need to backwash every two days or "the DE will work its way down into the sand".

Is this so? Do I need to follow some specific backwashing schedule if I'm going to use the DE?