As I finished my casting today and refilled and skimmed the junk off before turning it off I realized I might be doing this somewhat differently than others:
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Once I'm done casting I return all the spur to the pot along with enough ingots to fill it. I give it a change to heat up to melt all the added lead and I remove all the trash and such.
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This way it's one homogeneous mass and there is no water trapped inside that could explode when the pot is reheated down the road.
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It takes a bit longer for the pot to cool off but it's all ready to go for the next casting session