Freaking out , PM or Salt?!

[Animosity]

Also I fed for the very first time using megacrop on the last feed I did before going z72 hours without water. Then I watered tonight came down two hours later saw that… any chance I “flushed” the megacrop out and it saltified on the bag? First time engine grow they got fed nutrients… seems to much a coincidence nothing then I watered and all bags show this