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MODUL A RI <br /> WETLANDS <br /> Maintenance Procedures <br /> Screening Device <br /> 1 . Remove grate or manhole cover togain access to the screeningdevice in the <br /> Pre- <br /> Treatment Chamber. Vault type units do not have screening device. Maintenance <br /> can be performed without entry. <br /> 2. Remove all pollutants collected by the screening device. Removal can be done <br /> manually or with the use of a vacuum truck. The hose of the vacuum truck will not <br /> damage the screening device. <br /> 3. Screening device can easily be removed from the Pre-Treatment Chamber to gain <br /> access to separation chamber and media filters below. Replace grate or manhole <br /> cover when completed. <br /> Separation Chamber <br /> 1 . Perform maintenance procedures of screening device listed above before <br /> maintaining the separation chamber. <br /> 2. With a pressure washer spray down pollutants accumulated on walls and cartridge <br /> filters. <br /> 3. Vacuum out Separation Chamber and remove all accumulated pollutants. Replace <br /> screening device, grate or manhole cover when completed. <br /> Cartridge Filters 1 <br /> 1. Perform maintenance procedures on screening device and separation chamber <br /> before maintaining cartridge filters. <br /> 2. Enter separation chamber. <br /> 3. Unscrew the two bolts holding the lid on each cartridge filter and remove lid. <br /> 4. Remove each of 4 to 8 media cages holding the media in place. <br /> 5. Spray down the cartridge filter to remove any accumulated pollutants. <br /> 6. Vacuum out old media and accumulated pollutants. <br /> 7. Reinstall media cages and fill with new media from manufacturer or outside <br /> supplier. Manufacturer will provide specification of media and sources to purchase. <br /> 8. Replace the lid and tighten down bolts. Replace screening device, grate or <br /> manhole cover when completed. ' <br /> Drain Down Filter <br /> 1. Remove hatch or manhole cover over discharge chamber and enter chamber. <br /> 2. Unlock and lift drain down filter housing and remove old media block. Replace with <br /> new media block. Lower drain down filter housing and lock into place. <br /> 3. Exit chamber and replace hatch or manhole cover. <br /> www.modularwetlands.com <br />