Sand in pool

I never deep cleaned. I wish I thought of that before I opened n got everything running.

I live in Jersey ( 50 miles from nearest beach) so it must be from filter. I hope it's not a broken lateral. The filter is about 4 yrs old. I never changed the medium. It's called echo glass. Ever hear of it?

By the way u guys are the best donate your time like u do. We really appreciate it!!
 
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