I looked at the steel tank, curving upward over my head.
I pictured a woman drowning in a narrow steel tank and pushed the image away.
Standing by the lavatory wall was a large steel tank, full of rain water.
Water was collected from the roof and stored in two steel 500-gallon tanks.
With the same capacity, a flexible tank may have just 10% of a steel tank's weight.
Prices of the huge steel tanks necessary to kill bacteria with heat or pressure start around $250,000.
It is 134 feet high and holds 200,000 gallons of water in a steel tank.
When the cells fill that, they are transferred to a 20-liter steel tank.
It had looked to John like a big steel tank.