Thread: Coolant sludge - why??

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A while back I dumped the radiator to do some plumbing changes and the antifreeze was cloudy, but not excessively so and after straining through coffee maker filters am going to reuse as the test strip and volt meter say it's as good as new. Today, and before I put that antifreeze and water back in, decided to pull the engine pipe plugs, dump the rest of the coolant and add petcocks for the future. The crud that came out was almost sludge. Now, before someone say it had to be there from its earlier life, no, that engine was a brand new crate motor, with a brand new Walker radiator and all new hoses. Oh and I'm using distilled water along with the antifreeze.

WHY that crud???
(and that crud, it was deposited on my favorite tree stump in the woods to help kill skeeters later on)