Very large tent (Sandbach Heath CW11)

Large Teepee. Size 550 x 550 x 300 cm
Fly: Polyester 2000 MM F/R ( I have no idea what this means! Just copying the label )
Floor: Polyethylene Sheet
Poles: Steel Poles
Product Description : 12 Person Tent
Hydrostatic Head (again - no idea what this means! ) : 2000 MM
Teepee is packed in carry-bag approximately 90 cms long
It has been a few years since we had it up in the garden when I was hosting a large party.