[ccjohnson]

Don't underestimate the power of vacuum! A few years back I saw what it can do. A customer had a 400 bbl steel frac tank set up as a water storage unit. A truck driver forgot to open the air vent valve when he pumped out 73 bbl of water. It collapsed the almost brand new steel frac tank. (Rain for Rent style of tank) By using the 5 gal bucket, you isolate your tanks from the vacuum. As long as there is ample space for air to flow into the top of the bucket.