Okay, I feel very overwhelmed by our new pool and trying to figure it all out. (the pool came with the house, we did not put it in ourselves). This morning we backwashed the DE filter, however the valve to the rayvac was open when we added the DE ... does this mean all the DE was vacummed away from the filter? Should I backwash again and add more DE? Should I just add more DE with the valve closed? Eveyone here has been so helpful. I can't thank you enough!