Ah I see.
the idea of a water bath was literally that, a tray filled with water the carbon would be submerged in the water for while cutting then the water drained off and the carbon removed, dried and cleaned. My comments were from the manufacturer who comes from an arospace background so a small loss of strength is a big thing for them.
i see on the video that his water bath is not so much a waterbath as a cutting in a water jet with the outflow of water being collected in the bath and then drained into a large water container in this case a fish tank it looks like he has a small tank ata he'd to the spindle and the water is fed to the cutter by gravity I may be wrong on that.
I have a fealing that modifying the waterbath to be similar to haydn's might just work.
kendrick