Free plans for an efficient Hulda Clark style Zapper. Reputed to kill parasites in 7 minutes. "Home of the original $10.00 Zapper!"
Thinking for yourself is worth the effort.
"Any positively offset [DC] frequency kills all bacteria, viruses and parasites simultaneously given sufficient voltage (5 to 10 volts), duration (seven minutes), and frequency (anything from 10 Hz to 500'000 Hz)." (Taken from The Dr. Clark Research Association website.)