What does the soap do?
I use mine wet. Just enough water to get them damp. You don’t soak them like water stones.
I use the soap because it lubricates a little more then plain water and it suspends loose particles well. It also creates a little foam which helps prevent the water from running all over the place and making a mess. It works especially well if you have a flat dish behind the sharpener with a sponge in the water, the top surface above the waterline. With that setup, all you do is periodically dab the stones against the sponge to pick up the swarf and moisten the stone.
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