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					Tank information
Water 600mm freeboard
           Ft       Mts               Ft dia    M dia     1 ring     2 ring     3 ring     4 ring
Diameter      15       4.57                 9       2.7       3.45       7.81      12.17      16.54
Height         5       1.52                12       3.7       6.47      14.67      22.86      31.05
                                           15       4.6      10.00      22.67      35.33      48.00
                                           18       5.5      14.30      32.41      50.51      68.61
Volume                                     21       6.4      19.37      43.88      68.39      92.91
Gallons               4,962.16             24       7.3      25.20      57.09      88.98    120.87
 3
M                        22.56             30       9.1      39.15      88.71    138.27     187.83
                                           36      10.9      56.17    127.28     198.38     269.49
                                           48      14.6    100.78     228.36     355.93     483.50




Slow sand filter calculator
                               3
Daily flow required       400 m

                               2
Sand filter area       166.67 m    (100mm/hr)
                        12.91 m square

Tank diameter           14.57 m
 3
m /day
 SSF
     14
     25
     40
     57
     75
    100
    150
    220
    400

				
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