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Personally, I like using a JNat tomo to clean/condition my SG20k. It does a very nice job of cleaning out the swarf and also leaves a nicely wettable surface that doesn't cause water to form beads...

Yes, it's swarf, it's just embedded in the stone. Swarf by definition is just metal particles removed by a cutting or abrasive tool. The SG20k is not a friable hone - as I'm sure anyone who has used...

With all due respect, the hone doesn't just "pull graphite" out of the steel... It certainly is cutting the steel and embedding it in the hone. This is a fast cutting stone for a 20k likely because...