Hose to filter leaks

Jul 20, 2007
The hose leading from pump to filter kept popping off at the pump. I replaced clamps and hose but it still is leaking slowly at the filter. I've tightened as much as possible. I also notice the filter lost a lot of sand when the other hose was popping off and losing water (overnight twice)
What can I do to stop the leak and is the loss of sand something to be concerned with?