LOL.... toooo funny! The tank hold 100 lbs of Sodium Bicarbonate and it is sold in 50 LB bags. I paid $35 a bag. At that price it is getting washed away! BTW, Sodium doesn't remove rust real well at all. It does work really well at removing paint. It will not hurt rubber, chrome or glass. The set up I got converts to a sand blaster in minutes........ THAT takes the rust off!!