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− | <center><font size=3>''' | + | <center><font size=3>'''This table shows recommended maintenance activities for media filters'''.</font size><br> |
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Recommended Maintenance Activities for Media Filters (Sources: WMI, 1997; Pitt, 1997) | |
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Activity | Schedule |
|
As needed |
|
Monthly |
|
Annually |
|
3 to 5 years |