| abstract |
A method for treating water comprises: n (a) connecting a plurality of tanks each capable of holding water in series such that water can be transferred along the series of tanks from a first tank to a last tank, wherein each of the tanks comprises a bottom and light-transmitting sides; n (b) stocking the tanks with water and organisms for removing pollutants from the water, n (c) inputting water containing pollutants to the first tank; and n (d) outputting water from which said pollutants have been removed from the last tank. |