I thought prretty much most applications were like that (Pump higher GPM than filter). Maybe I'm wrong??
My Hayward pump is 75GPM and my S-T166 Filter is rated at 35GPM.
I do also get just a touch of fine "sand mist" when the filter first starts (just before I'm about ready for a backwash),
however . . . I thought that (in my case) that it's attributed to the fact that I have a small layer of Pea Gravel at the bottom of my filter which really "shouldn't be there in a 100lb filter, and (mostly) the fact that my sand level (which should be about 1/2 way up the tank) is about 3/4's of the way up.
In years past, I think a lot of people used Pea Gravel at the bottom few inches of the filters around the laterals but I don't think it does much (possibly hurts??) in a smaller filter like a 100lb like I have. I'm really happy with the filtering and clarity but I've checked the laterals for breaks (all fine) and still get just a fine mist of sand on start up.
But . . . even though I backwashed (lots) and rinsed, I do have new filter sand so maybe after a few extended backwashes etc, some of the finer particles will come out. It is way better now then when I first started up.
I'm going to remove some sand when I winterize this year.
I'm going to follow this thread to see the coments