Faint spots on new plaster ?

New pool filled last week of May. Been testing and following TFP faithfully. I have 4 small spots in various parts of pool very hard to see w naked eye but diving w goggles looks “sand” gathered or something else. Maybe the size of a quarter in each spot. I’ve rubbed w a tri chlor tab and brushed and nothing. I’m waiting on plaster company to come see. Just want to know if it’s part of the micro fusion imperfections or something wrong. Attached photos taken from outside of pool. Not much...

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