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grin
No flat side!!! Look closer.

On the welsh stones that seller offers three different grade/ grit
Since they develop slurries the grit is hard to specify.

I went os an old High school....

228034

This is a medium grit kitchen knife stone by Norton
I show this as an example of a sway back.
There is enough stone left to flatten it and have material left for use.

I am interested...

Hi
Grinding sounds harsh.
The "Flattening" process is more what I had in mind.
Most of the vids I have seen show a flattener in use at almost every sharpening shown.
These stones are...

Hi

I have an old small stone that is gummed from old oil.
The dishwasher.... not any effect.
Boiling with detergent... no
Finaly grinding the surface with an oil based abrasive...