Atlanta Aquarium ...my wife and I took our 5yr old son the the Aquarium and did the extra behind the seens tour of the largest aquarium at 6,300,000 gal of water...its huge..I made a coment to the guide on the tour that the water is unbelievably crystal clear and ALMOST as clear/sparkly as my pool he then turned the topic to the pumping and filtration of the huge fish bowl and said it gets turned over once every hour ...thats like 105k GPM..who would have thought! !! I would have loved to see that pumping station...but anyhow..thats like turning ove my pool 5 TIMES a minute ....pretty darn impressive huh....