I guess Iam the only one using HVAC. mine is 120 volts AC 60 hgt easily made from staples lamp., using only the neon tube (type). I believe I get supream CS, mico tyndall effect. I also use .99999 (5) silver rods. I can get 5PPM in appox 2hrs. nice and slow the AC is steady and just etches the silver away.(sub atomic). cost of my set up 20.00 dollars. not bad