De-rusting some stuff

What I read this time was 1 cup of baking soda or laundry soda to 5 gallons of water. So here I have 15 gallons of water and about 3 cups of baking soda. I used 4 "sacrificial anodes" that the positive lead hooks to. They are all connected via the red wire you can see. They run to the bottom of the tub. I think the idea is to draw through all angles. The last time I did this I only used one. It worked too. Then the negative lead hooks directly to the part you are trying to clean. Power up!