For firefighting purposes, you absolutely can use an OUTBACK Plunge Pool instead of a traditional tank. In fact, this is often a better solution as the filtration system ensures the correct water volume is maintained, so you can be assured the volume of the static water source is always correct during an audit.
What grade of stainless steel is it made from?
316 Stainless Steel. This grade is commonly used in heat exchangers, jet engine parts, pharmaceutical and photographic equipment, chemical processing equipment, tanks, evaporators, and now