10
9
Filter Maintenance
Step 1.
Close the inlet valve to the filter.
Allow the filter to drain to its "paused"
level before beginning this procedure.
Step 2.
Close the filter outlet valve
(figure 9-1).
Step 3.
Remove the filter float valve
assembly at the union connection.
Anti-siphon
valve
Filter
outlet
valve
Float
valve
Union connection
diffuser basin
Maintenance
drain valve
Filter
inlet
valve
Figure 9-1
Step 4.
Connect the CIP hose to the CIP reverse flow valve
downstream of the pump. Open the valve to ensure that the
flow rate restriction device is limiting the flow rate to
approximately 4 litres per minute to prevent damage to the
filter media. Connect the other end of the hose to the lower
valve on the filter standpipe (figure 9-2). Open both valves
and dispel any air in the line through the anti-siphoning valve.
Close the anti-siphoning valve.
CIP reverse
flow assembly
Figure 9-2
Step 5.
Turn the handle on the clean in place (CIP) mechanism to agitate the top of the
sand while the water level is slowly filling from the bottom. Allow the water level to rise
until the diffuser basin is filled with water.
Step 6.
Once the diffuser basin is full of water, stop stirring the CIP and wait for 30
seconds. Now flush the dirty water from the sand surface through the maintenance
drain.
Note
: It is important to wait for 30 seconds after stirring the sand before flushing the
dirty water off the top of the filter media. This will prevent sand from being lost from the
top layer of the filter media.
Step 7.
To restart the filter, close the filter maintenance drain valve, the CIP reverse
flow valve downstream of the pump and the lower valve on the filter standpipe.
Step 8.
Re-attach the filter float valve assembly inside the filter. Open the inlet valve to
the filter and the anti-siphoning valve on the filter.
Step 9.
Open the filter outlet valve.
SUGGESTION
:
Keep a maintenance log posted nearby to keep track of when the
filter is maintained.
