What is this?

Hey y'all. Since my pool has been done in February, I've had dust and dirt on the steps. I just assumed this was stuff blowing in the pool, but yesterday I picked it up. In addition to dirt and clay I found something strange. It actually looks like clear crystals. Like salt only larger. I do have a SWCG.

FC 3.0
TC3.0
ph 7.7 (I say 7.7 because it lives between 7.6 and 7.8 )
TA 80
Calcium 50
CYA 30

These numbers are almost always the same. Never had any algae. Vinyl liner

What do you think?
 
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