I don't know, but I am going to find out. I just figured my gallons assuming an average depth of 6ft I came up with 2.9M gallons. So I need to know the same thing you do. I am glad I read your post though. I did not know you were supposed to turn the pond over every 24 hours. So If I only run it at night, am I supposed to turn it over in 12 hours? Sounds expensive...
