I haven’t tried a hospital grade receptacle yet but I will. I did run a 20-amp dedicated line through. But you have to try this. I noticed an immediate reduction in upper grain and sibilance. If you live in Florida or another similar climate with sandy soil, dig down a foot or two next to you ground rod. Be careful and look for lines (phone, cable, etc.)/ Run your garden house in that hole for about 15 minutes.
It always amazes me when I think of or find simple stuff like this that work.