I have a Doughboy Silica II filter. It recently started "blowing" sand back into the pool when the pump is restarted. Each time the pump is turned on a couple of handfuls of sand is blown back into the pool. It then stops, until the next time the pump is cycled. I know that other posters have been told that a "lateral" might be broken. Does the doughboy have "laterals"?
Thanks for any help, in advance.