What is this stuff at the bottom of my bottle

I usually buy these bottled frappes by the case as I have one every morning at school, and recently I bought one of these cases in which Every. Single. Bottle. Has these white chunks at the bottom of them, some larger than others but still. Anyone know what it is? 😭

I usually buy these bottled frappes by the case as I have one every morning at school, and recently I bought one of these cases in which Every. Single. Bottle. Has these white chunks at the bottom of them, some larger than others but still. Anyone know what it is? 😭