Filter returns debris back into pool

[RobHudson]

My pool filter shoots debris back into the pool. For the most part, it’s small pine needles. I’ll post a picture of the spa, you can kind of see them sitting on the bottom. The occasional small bug comes out of the return too, but it’s mostly the pine needles.
Where do I start?

 

[woodyp]

When is the last time your grids were cleaned and inspected for holes and such?

 

[RobHudson]

When is the last time your grids were cleaned and inspected for holes and such?

it’s been 3 summers since they’ve been replaced. I normally have a service open and close the pool. They take the grids out each winter, so I suppose that qualifies as cleaning.
Also, this problem started last year. It’s just been low on my list of pool things to get to.