I have a Big Berkey and smaller one for TEOTWAWKI but thankfully my well water here is good so no need to use them.

Did the filters get that nasty on just your tap water?

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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.

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.