=============+======================================================== | ~Million gallons filtered since previous:~ +-------------------------------------------------------- Month. | Scraping. | Raking. +--------+--------+---------+--------+--------+---------- | Max. | Min. | Ave. | Max. | Min. | Ave. -------------+--------+--------+---------+--------+--------+---------- 1909. -------------+--------+--------+---------+--------+--------+---------- July | 229.01 | 106.27 | 163.289 | 0 | 0 | 0 August | 175.54 | 124.94 | 152.581 | 0 | 0 | 0 September | 237.52 | 114.37 | 161.702 | 0 | 0 | 0 October | 206.09 | 78.78 | 132.359 | 96.50 | 71.51 | 82.708 November | 168.19 | 82.32 | 112.603 | 99.00 | 90.23 | 94.615 December | 135.77 | 128.33 | 132.647 | 144.35 | 106.11 | 125.940 -------------+--------+--------+---------+--------+--------+---------- 1910. -------------+--------+--------+---------+--------+--------+---------- January | 204.38 | 146.58 | 178.461 | 189.48 | 152.33 | 170.735 February | 205.73 | 205.73 | 205.730 | 192.98 | 118.85 | 158.890 March | 275.96 | 257.36 | 265.493 | 249.68 | 224.49 | 238.993 April | 295.96 | 104.13 | 181.972 | 307.57 | 45.22 | 142.448 May | 186.64 | 81.66 | 150.230 | 102.15 | 69.79 | 85.978 June | 213.70 | 130.85 | 171.059 | 181.25 | 167.84 | 174.540 -------------+--------+--------+---------+--------+--------+---------- Year 1909-10 | 295.96 | 81.66 | 159.151 | 307.57 | 45.22 | 143.832 -------------+--------+--------+---------+--------+--------+---------- Fiscal years: -------------+--------+--------+---------+--------+--------+---------- 1905-06 | 497.45 | 116.66 | 240.379 | 0 | 0 | 0 1906-07 | 466.12 | 69.76 | 220.693 | 103.28 | 32.13 | 76.870 1907-08 | 477.19 | 28.20 | 146.912 | 165.25 | 17.08 | 75.775 1908-09 | 298.08 | 39.26 | 125.617 | 244.19 | 41.41 | 88.439 =============+========+========+=========+========+========+=========== In re-sanding a filter, it is first filled with water to the proposed depth of the sand layer. The outlet end of the hose is connected to a 3-in. pipe which is supported on a boat, and the sand is discharged through this pipe at the point required. Work is first begun at the far end of the filter, and it is gradually filled by swinging the boat from side to side and backing it by degrees to the front end.