I have a DE filter and I am backwashing a lot more then I was told I would have to. The problem I am having is after I backwash I noticed a white residue all over the ground. It leaves this clay like powder, which I know is the earth stuff. But any suggestions on how to avoid this look? It’s all over the ground and stays there until it rains heavy where is can be washed away. Sand filter was easier when it came to backwashing.. Any suggestions? Do customers build something in the ground where the dirty water can drain into? Thank you