sand returning in pool

[matt4x4]

I'd like to know what part of changing laterals is hard? Maybe the turning over of the heavy filter tank to scoop the sand out???
Best way to get the sand out is remove the multi port valve, turn tank on it's side, use a hose to wash it out -basically letting the water do the work, once clean, reach in and unscrew the laterals, inspect and replace as necessary - I would also inspect the standpipe and fittings, sometimes those are the culprits.

[victus]

Could this problem be also caused when the pump's GPM flow exceeds the sand filter's GPM flow rating and forcing sand out of the filter??