It is a pond made by a society that works for public oceanariums here in Europe.
In USA you have some similar ponds in aquariums too, see the following video examples:
The filtration will arrive separated within few months.
It is a growing tank for 1 baby Nurse shark (that I have actually), a couple of baby White-tip reef shark and 1 baby Black-tip reef shark. I will buy a bigger tank in a few years, especially for the nurse shark. Luckily I have the space + time of buying enormous tanks as a private.