Hayward S200 sand filter - sand in pool after every backwash

[robbegginer]

Last Summer we noticed a faint cloud of sand entering the pool as the pump restarted after a backwash & rinse. The problem continued this year, probably worsened. I suspected a broken lateral, so got a new assembly and took apart the filter. I looked up close and felt the undersides of the laterals and they all seem fine. After taking it apart, found out that I'll need to make a wrench to take of the nuts which hold the upper and lower pipes into the sand filter. So I was not able to finish removal today. But it surprised me that I didn't see one broken or missing.

I did take a photo of the lower pipe where it joins with the lateral assembly. Is that space supposed to be there, or should it fit tight up against it?

The filter also seems to be less effective, take longer to clear the pool during a SLAM.

Any thoughts?

 

[dBsooner]

Did you get a good look at the spider gasket? Or have you even looked at it yet?

 

[robbegginer]

Did you get a good look at the spider gasket? Or have you even looked at it yet?

Have not looked at in years. Though when we first moved here I did, and had purchased a spare one at the time.
Will have a look at it tomorrow. Thanks

 

[Texas Splash]

I can't confirm if that tiny space is an issue. Doesn't seem like it should be. Perhaps once you get everything out tomorrow you'll see something more obvious.