I think that just about anything will work,I've wound many types and sizes,and they all work.It just comes down to what size Henries your after.That core won't need as many turns to get to your target as would an iron core material.
As you start tuning ,you'll see the differences really quick.
That's alot like the core I'm using
Don
Don,
How do
they work and what do they do? Right?

What are you tuning onto and what do you see? I guess none of the below setups.
-Resonance LCR series/parallel
-Parasitic Resonance
-Resonance Cavity
-Parametric Resonance
-Resonance Waveguide
I assume you are targeting (first) only on the demo WFC (tubes/plates) setups and that these setups don't do more gas output then electrolysis.
Only a different method

My understanding is when one of the above method's are incorporated, we can see more gas output.
That's what Stan did, incorporating more effective methods creating higher powerful pulling static fields... (voltage amplitude)
br,
webmug