PEP Filters BMF - Manual (Page 6)

BMF Series Media Filter
Operating & Maintenance Manual
PEP Filters • 322 Rolling Hill Road • Mooresville, NC 28117 • 800-243-4583 • www.pepfilters.com
704-662-3133 (Outside USA) Page 6 of 14 Fax 704-662-3155
rev. 01/02
Maintenance Procedures
Pump Pre-strainer (if equipped)
Warning: Disconnect all electrical power prior to performing pump maintenance. The filter pre-strainer basket on the pump inlet
must be checked regularly and kept free of debris. Failure to do so may damage the pump and/or motor. Shut off the power,
close the valves, open the manual air relief valve, remove bolts and the pre-strainer cover. Lift the basket out of the housing and
remove any foreign material. Replace the basket, lubricate the O-ring, install the cover and tighten the bolts.
Backwashing
Differential pressure across the filter media progressively increases as trapped particulate accumulate in the filter media bed. On
filters equipped with automatic backwash, the backwash cycle is initiated upon reaching a 16 psig pressure differential. Since
units with automatic controls perform this function as necessary, a detailed backwash procedure is only provided for manual
units. However, automatic units can be manually backwashed by pressing the manual push-button switch located on the control
panel. The backwash cycle is field adjustable on most units and is factory set at three minutes. To prevent unfiltered water from
“short circuiting” through the media and to extend media life, the filter should be backwashed regularly; at least once every
couple of days on manual units.
For manual backwash filters using backwash water source other than the unfiltered source water (e.g. city water):
1. Shut off the electrical power to the pump motor.
2. Move the handle on the linkage to position the valves in backwash mode.
3. Allow the filter to backwash for approximately three minutes.
4. Move the handle on the linkage to return the valves to the filtration mode.
5. Re-start the pump motor.
For manual control units using the system water for backwash:
1. Shut off the electrical power to the pump motor.
2. Move the handle on the linkage to position the valves in the backwash mode.
3. Re-start the pump motor.
4. Allow the filter to backwash for approximately three minutes.
5. Shut off the electrical power to the pump motor.
6. Move the handle on the linkage to return the valves to the filtration mode.
7. Re-start the pump motor.
Filter Vessel
The filter vessel internal components should be visually inspected annually or whenever backwashing does not reduce the
pressure of the filter tank to the starting media gauge pressure. Remove the access port on the top of the tank to inspect the
internal components.
Note: Always use care and follow proper shut-down procedures. Inspect the over-drain assembly for any debris blockage or
damage and clean or replace if necessary. Remove and inspect the media. The BMF filters have hand access ports located on the
side of the tank for easy removal of the media and inspection of the under-drain assembly. Over a period of time, foreign matter
may become imbedded in the media pack that cannot be removed by backwashing. Contaminated media should be disposed in
accordance with state and federal requirements. Unscrew the under-drain laterals and inspect for blockage or damage. Clean or
replace if necessary. If replacement of one or more laterals is necessary, it is recommended to replace all laterals in the under-
drain. Refill the vessel with the proper amount of new media, following the procedure for media loading.