The same basic bolt-together design allows any size of tank to be created.
The tank can be filled to the brim creating a horizon line at a green screen, while capturing the overspill in the integrated gutter.
One example of an OMEY tank at Ashford Studios, 25m x 25m approx.
Water meets green screen
Gutter catches overspill and recycles.
Important to leave enough space around the outside of the tank.
Same basic principle for tanks on a sound stage - although less overspill
The tanks can be heated to 25deg, say for night shoots.