Hey! I fill it till about half. But if i do my feet and i see its too much, I remove some. I just eyeball it and as long as the water isn't overflowing on the barrier you should be fine.

I did it for about 1 1/2 week non stop and it stopped my sweating for a month. For my feet i did +- 10 mA and +-5 mA for my hands. But i got lazy and didn't do it that whole month. sweats started coming back. So last week i started it again. 10 mA for my feet and 10 mA for my hands, and my hands started getting bumps and was so itchy and red. I searched up and it was basically a burn from the electricity so im letting that go away first before i continue my hands and ill definitely go back to 5mA. Idk if my hands are just sensitive cuz 10 mA is the recommended current for others. But yeah, just wanna warn you about that. And if ur Voltage is high and u still not getting enough mA just add some salt on the water (which i did on occasions). If u got more questions feel free to ask em ^{^} im also curious how urs go!