Norton combination oilstones, crystolon, Carborundums up to & including 1000 grit, finish on a beat up Swaty.
There are a hundred different choices out there, a good Norton combo can cost $20.00 & last you forever with that one knife.
I never run my EDC knife through a slotted tungsten carbide cutter; the thought alone gives me the shakes, should be a law against it, punishable by a beaten with a
cat–o'–nine tails.