Washing The Screens; Repairing Screen Panels - Pentair PR AQUA ROTOFILTER Installation And Operation Manual

SECTION 11: SCREEN MAINTENANCE
4. With the backwash system off and the tank/sump
empty, run the Rotofilter and evenly apply the
solution to the screens using a common garden
sprayer or similar device.
5. Leave the Rotofilter turning for 20 minutes
to prevent pooling and dripoff. Rinse the
screens and the inside of the machine with
a pressure washer.
6. Flush and drain or pump out the enclosure.
7. Follow the Rotofilter Startup procedure as
described in Section 8.1.

11.2 Washing the Screens

Always follow the proper shutdown procedure
(Section 8.2 or 8.3) before performing any
maintenance on the Rotofilter.
Wash screens with high-pressure washer
periodically. Be sure to hold the pressure washer
nozzle at least 46 centimeters (18 inches) away from
the screens to prevent screen puncture.
Do not exceed 7.0 kg/cm2 (100 psi).
Pressure above 7.0 kg/cm2 (100 psi)
will damage the screens. Do not
hold the pressure head closer than 46 centimeters
(18 inches) from the screens. Do not use an
oscillating pressure head. An oscillating pressure
head will damage the screens.
Periodic removal of screens for deep cleaning
and power washing may be required if organic or
mineral loads are high. The frequency of these
cleaning procedures is entirely dependent on inlet
water quality. An increase in backwash frequency
or a decrease in flow capacity indicates that
cleaning is required.

11.3 Repairing Screen Panels

Panels with damaged cells and an intact grid can
be repaired using screen repair plugs. Replace
panels that have sustained damage to 3% or more
(maximum 10 plugs) of the screen cells.
11.3.1 Tools
Utility knife
Screen repair plug
Blunt object (such as a pencil eraser)
11.3.2 Procedure
Always follow the proper shutdown procedure
(Section 8.2 or 8.3) before performing any
maintenance on the Rotofilter.
1. Locate the damaged cell. Ensure that the grid
around the cell has little or no damage.
Figure 38. A damaged screen cell
2. Cut the damaged cell out using a utility knife. Be
careful not to damage the surrounding grid.
Figure 39. Removing a damaged cell
PR Aqua Rotofilter™ Drum Filter Installation and Operation Manual
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