I use Festool 27/36/50 mm anti-static hoses (what I bought, originally) depending on the Festool in use.
But, I also use 4” non-anti-static hoses (Rockler/Woodcraft) with my jointer, planer, band saw, belt/disc sander, and Jessem router table.
I also use/like Rockler’s Dust Right® Universal Small Port Hose Kits.
The ALL METAL Dust Deputies seem to handle the grounding issues just fine.
Remember, they’re grounding to a concrete floor.
Fittings for the Dust Deputy are “challenging” (a pain in the butt) - Whether the cyclone’s plastic or metal.
Some guys use duct tape, but that’s a little too “dedicated” (permanent) of a setup for me. I’m usually changing hoses/tools, depending on what I’m doing.
With a little trial and error - And fittings from Rockler, Woodcraft, and the plumbing department at HD - I “cobbled together” a “swap out system” that’s quick and functional.
With any of 6-8 different size connection fittings, I can quickly adapt any hose to the DD intake ports. I just keep ‘em sitting on top of the DD’s collection canisters - And grab the one for the hose I’m going to use.
The hoses from the DD’s outlets - To my Festool CT’s - Are done with short Festool 36mm AS hoses - Connected by Rockler connector fittings.
Virtually no material is actually going into the CT. It went into the Dust Deputy.
So... This hose connection is really just to create suction from the CT vacuum.
Again... The ALL METAL Dust Deputies seem to handle the grounding issues just fine.
As Sedge says: “I hope this helps”.