I used a junky battery tender, the tiny kind you get at autozone for $20 that's 6V or 12V. It has to connect to a battery to initiate a charge to, but you can vary the resistance of the water buy putting in more or less sodium carbonate (bicarbonate, I forget), and sanding the sacrificial anode so it's bare. Your mega charger would work, but you should research what the ideal method is, which I don't know. It took maybe 8 hours of being hooked up to the charger, with sanding of the sacrificial anode (which gets plated with the rust) every hour, or whenever the charger stopped charging becuase the resistance got too high. the whole process took a day. Boring and tedious, but incredibly satisfying at the end! I did a Honda C70 (shown) tank two honda hobbit tanks (with decent results, though the anode can only "see" about half the tank, and a Honda CB550 tank. The C70 tank is the best because the whole inside is concave. If the anode cant see the entire inner surface of the tank it takes longer, I think (but I may be wrong). Whatever is closest to the anode gets cleaned first.