3-44. FILTER TANK MAINTENANCE - continued.
Wear protective equipment while working with media.
Cover a 6-foot (1.83m) square area of the floor in front of lower flange cover to
catch filtration material
Remove eight screws (8), nuts (5) flange cover (7), and gasket (6) from top handhole (14). Discard gasket.
Weight of media is over 1000 pounds (454 kg). Remove flange
cover carefully to avoid personal injury from flange cover
Remove twelve screws (9), nuts (11), flange cover (10), and gasket (12) from bottom handhole (13). Discard
Remove fitting (2), elbow (3) and reducer (4) from multimedia filter (1).
Replace all damaged components.
Be careful while removing media not to damage laterals with tools.
Using a hand scoop, remove filtration material from multimedia filter (1) and discard.
Turn multimedia filter (1) on side and use garden hose to flush out remaining media.
Using soap solution and stiff-bristled brush, clean flange covers (7 and 10).
Clean flange ports (13 and 14), mounting screws, and nuts.
Inspect inside and outside of multimedia filter (1) for cracks, evidence of leaks, damage, or excessive
Inspect flange covers (7 and 10) for excessive corrosion and wear.
Inspect all inside parts for corrosion and wear. Ensure diffuser tube vent lines and screens are not clogged.