
Up-Flo Filter with Extended Maintenance Cartridge
Operations and Maintenance Manual Rev. A
October 2019 Page 5 of 11
Inspection and Maintenance
Routine Inspection
Inspection is a simple process that requires monitoring pollutant accumulations. Maintenance crews
should be familiar with the Up-Flo®Filter and its components prior to inspection.
The following instructions are intended for non-Hydro maintenance service providers and/or
those intending to maintain their own Up-Flo®Filter:
Routine Inspection Procedures
1. Set up any necessary safety equipment (such as traffic cones) to provide access to the Up-
Flo®Filter. Safety equipment should notify passing pedestrian and road traffic that work is being
done.
2. Remove the grate or lid to the manhole or vault.
3. Without entering the vessel, look down into the chamber to inspect the inside and to make note
of any irregularities.
4. Without entering the vessel, use the pole with the skimmer net to remove floatables and loose
debris from the chamber.
5. Using a sediment probe such as a Sludge-Judge®, measure the depth of sediment that has
collected in the sump of the vessel. Maximum sediment depth is 6 inches (15 cm).
6. On the Maintenance Log provided by Hydro International, record the date, unit location,
estimated volume of floatables and gross debris removed, and the depth of sediment
measured. Also note any apparent irregularities such as damaged components or a high
standing water level.
7. Securely replace the grate or lid.
8. Remove safety equipment.
9. Contact Hydro International to discuss any irregularities noted during inspection.
Routine Maintenance
The access port located at the top of the manhole or vault provides access to the Up-Flo®vessel for
maintenance personnel to enter the vessel and remove and replace filter cartridges. The same access
would be used for maintenance personnel working from the surface to vactor out sediment, oil, and
water (Figure 2). Unless the Up-Flo®Filter has been installed in a very shallow configuration, it is
necessary to have personnel with OSHA Confined Space Entry training performing the maintenance
that occurs inside the vessel.
Maintenance intervals are determined from monitoring the Up-Flo®Filter during its first year of
operation. Depending on the site, some maintenance activities may have to be performed on a more
frequent basis than others.
A vactor truck is normally required for oil removal, removal of sediment from the sump, and to dewater
the vessel for replacement of the filter cartridges. All inspection and maintenance activities would be
recorded in an Inspection and Maintenance Log.
The access port located at the top of the manhole provides unobstructed access for a vactor hose
and/or skimmer pole to be lowered to the base of the sump.