Getting Sand in my Pool

[Vinyl_Guy]

Frank,

I'd try the rinse/backwash rotation a few times before bringing it back to filter.

Rinse
Backwash
Rinse
Backwash
Rinse
Backwash
then finally filter.

(shutting the pump off in between the turning of the valve handle each time, that your doing correctly).

But that's more a remedy for high pressure, then anything else, which you are not experiencing.

Nothing but the highest of pressures should cause sand to get back through and into the pool. The filter itself is designed to not let sand through, so you could have something wrong with it mechanically. It could have been installed improperly and you just starting to see the effects of that now.

[Watermom]

Are you certain that it is sand and not just dust? Also wondering what size pump and filter you have. Sometimes people have a pump that is too powerful for their filter and it just blows stuff right back into the pool.