MCU16/0012 Attach B Engineering report & SMP

Plate 24 Check seals are pushed against the Plate 25 Check joining rivets (two piece unit
pit walls                                   shown above)




3.5 Filter Bag Inspection and Rejuvenation
Following the emptying and cleaning of the filter bags, the filter bag should be inspected to evaluate the bag
condition. Given the nature of stormwater the filter bag from some Enviropod units can become considerably
clogged with fine sediment. Filters can also be damaged by various objects in stormwater as well as fauna.
Sharp objects such as sticks combined with high velocity water and a large mass in the filter bag can cause
small tears in the filter material. Animals such as rats have also been known to chew through fine mesh filter
bags located in gully pits near takeaway food outlets.


3.5.1 Clogged Filters
Clogged filter bags can be clean using several different methods. If the bag cleaning techniques described in
the general maintenance sections above are not able to clean the filter bags the following options should be
considered:
     Using a stiff brush and a bucket of soapy water scrub the filter bag surface.
     Remove filter bags from the pit and wash the bags using a high pressure water spray. Care has to be
       taken to not transfer the contamination elsewhere. Waste water from the process should be collected
       of and disposed of correctly.
     Remove the filter bags from the pits and the support rings and wash the bags in an industrial washing
       machine.

The final option presented above typically results in the bags appearing like new, with no visible stain or pore
clogging within the filter mesh.




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