FILTER TANK MAINTENANCE - continued.
Install reducer (4), elbow (3) and fitting (2) on multimedia filter (1).
Pouring coarse gravel through upper hand hole opening may damage filter lining.
Place a total of 240 pounds (109 kg) of 1/4-inch medium under bed gravel in multimedia filter (12) through
lower handhole opening (8).
Use paddle or narrow board to level gravel.
On lower handhole opening (13), install new flange gasket (12), flange cover (10), and twelve bolts (9) and
Steps e through i must be performed in sequence.
Using hand scoop, place 170 pounds (77 kg) of No. 12 coarse garnet through upper handhole opening (4).
Repeat step e for 180 pounds (82 kg) of No 50 fine garnet.
Repeat step e for 230 pounds (104 kg) of filter sand.
Using hand scoop place 345 pounds (156 kg) of No. 2 anthracite.
On upper handhole opening (14), install new gasket (6), flange cover (7), eight bolts (8) and nuts (5).