Is this mustard algae?

Jun 25, 2018
16
Brick, NJ
Pool Size
10000
Surface
Vinyl
Chlorine
Liquid Chlorine
All season I’ve been finding what I think is sand in the pool. I vacuum the pool with a skimmer sock to get it out and then every time I run my filter more appears but I’m not actually sure now if it’s sand or mustard algae. Can anyone tell from these pics?
 

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What brand and specifications of sand is in your filter?


 
Also I should mention this also happened last year and I changed out the valve/spider gasket and laterals Bc I thought that would solve the problem as I read on a few other posts. The sand was changed at the same time.
 
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