100% city tap water. I didn't try and experiment with pond water or anything.

I'm pretty sure the gelatinous goo was biofilm produced by bacteria. I am definitely not waiting this long to clean them again.

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I'm glad you checked it. You do not want to be drinking that shit.

I saw a couple of YT vids on the hit-and-miss effectiveness of the Berkey's recently but did not save the links.

I first fill a brita water pitcher before using that to fill my Berkey with city tap water. I am much more likely to change the filter on the brita every couple months. The Berkey filters still look very good.