4th April 2012 at 1:41 pm #764
Went to a recreational water park (SeaWorld USA) with my children and caught a glance at the large water processing recirculating plants associated with it – I was amazed to see biosand filters 10 meters high and at least 25 meters in diameter filtering both fresh and salt water – These engineers have solved many of the problems we are working on – If contacted they would be a great asset in developing large type water filters as you are suggesting – Following is a possible contact site – I wish I had the time to help you with this.
http://www.seaworldsandiego.com/contactus.aspx
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LCDR US Public Health Service Retired