The dish was covered on that countertop for three days, with full sun from 0700 to 1000.
Three days later ๐, as I said in the post below, I can present something new regarding water daily.
The contaminates in the tap water, along with the added PAA and MSM, dry into this presentation every time with the distiller residual. Typically in three days.
I've performed vacuum distillation in laboratory and the residuals (due to salts and metals) look exactly the same. I'd need a lot of time to dig and find the photographs, but that said, the crystal pattern and formation is typical from work I've done in the lab with respect to clean water processing for vacuum compression distillation crystallization work. Crystallization is complex and there are two main types.
Note, we also had one vacuum distiller prototype explode in chemical fume hood with a leak occurred and was rapidly plugged, which rapidly drew down the vacuum at high temperature, which vaporized a ton of water instantly, ruptured glass prototype vessel (used to visually explore the distillation effectiveness with various vacuum-driven compressors) and that resulted in the patterns you're seeing as well (but this was with industrial waste water).
The lab work successfully progressed to the field where we demonstrated a steady-state vacuum compression distillation module that could process a barrel of dirty industrial water per day. We also went through National Science Foundation (NSF) I-Corps program at LSU in Baton Rouge, LA USA with the work after the initial lab prototyping work was completed and validated to remove the impurities (our focus was on Chemical Oxygen Demand COD).
Note, if you're not blowing stuff up when prototyping there is something wrong, cause that is the nature of prototyping. However, the amount of energy released when a high temperature salt/brine/water mixture is rapidly pulled under vacuum is quite impressive (from a very small leak/pin-hole sized leak that was plugged, went against intuition, e.g. that such a small leak would result in a rupture when plugged). Using off the shelf coffee pot or distillers is best for what you're doing (safest).
Hope this helps add some perspective, based upon actual distillation experience.
So, I distill my water too. A question that I think about is does anything survive the distilling process? Does the water I have AFTER distilling it, that I drink. Does anything remain in the steam that turns back to water?