Grey/white spots on the bottom of a Brita filter, possibly mold

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BRITA Flow XL Water Filter Tank 8.2L Fridge Dispenser Jug + 1 Maxtra+ Cartridge 4006387088125

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Is this mold or just hard water buildup in my Brita filter? : r/Mold

Brita XL Water Filter Dispenser for Tap and Drinking Water with 1 Standard Replacement Filter, Lasts 2 Months, 27 Cup Capacity, BPA Free, Grey: Home & Kitchen

What are these little green balls in my Brita filter?? : r/Whatisthis

Brita water bottle, new filter made these black dots on the mouth piece, even after deep clean they won't come off(not bumpy), is this black mold somehow? : r/Whatisthis