Losing sand when backwashing

[Needzo]

Recently I have noticed that after I backwash there is sand on the driveway by the drain pipe, it has only happened since I opened this year. What could be causing this? is my filter all done? Thanks

[Watermom]

Is it a lot of sand? It isn't uncommon to lose a little when you backwash.

[Needzo]

maybe up to a 1/4 cup each time,

[Poconos]

Probably not to worry. You do get churning and will lose a little each time as Watermom said. I always see a little in the sight glass.
al

[Needzo]

That's relieving, Thanks for the info!