The town wants me to put a 4x4x4 dry well in. It's for back washing pool. We don't backwash with the pentair filter cartridges. There was a C of 0 for this pool but because it was a bank sale house the town said they just want to look and make sure the fence it up. They said they will be easy on us. We had to move the fence. To close to the wet lands. I lost 60x150 of yard. The town came back and now said the holes in fence are to large and it can be climbed. Back to back washing with dry well. Did any one had to put this in ?