Q&A: Why is there white sediment at the bottom of my foaming face wash bottle?

In the monthly Q&A, Chavi asked, Hi Susan! I made the attached formula for a foaming face wash. I needed to adjust pH and I did so using some citric acid solution. The next day, I noticed some white settling on the bottom; it disperses when shaken but then resettles. Any idea what it is or why this…

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