right now we use an 80gal aquarium (sp) air pump with dual air lines that hang to bottom of our 55gal drum and let air pump through the fuel for about 24hrs...

 

If you're going to water wash and bubble dry you need to put airstones on the air lines to break the bubbles up. I also helps to put some sort of dispersion mechanism to spread the bubbles out.

Better yet don't water wash use Magnesol to dry wash then no drying needed. You get a better product and eliminate many problems.