NOTE: It is important that all piping and components associated with the filter system installation must
be supported to eliminate stress on the filter and piping.
NOTE: Do not reduce the pipe sizes listed, the pipe sizes are minimums. If long runs, excess fittings, or
lifts are necessary, it is recommended to enlarge the pipe diameter in order to reduce friction loss.
Never reduce the waste line; this can restrict the flow of the backwash cycle and reduce efficiency.
NOTE: The sewer drain must be large enough to handle and maintain the flow of the backwash cycle.
If the drain is not large enough to support the volume of waste generated during a backwash cycle, it
may be necessary to use a reservoir tank to collect the waste water. The flow from the reservoir tank
can then be regulated to the drain. It is not recommended to have any restrictions in the waste line.
However, it may be necessary to install a valve to manage the flow to the drain. If this is necessary, do
no throttle the flow to less than the minimum backwash flow (Table II page 7).
NOTE: Never overtighten service unions on the filter unit. Service unions should be hand tightened only.
Overtightening can cause damage, which may result in leaks.
NOTE: Always follow local, county, state or other government authorities requirements for piping hook-ups.
P U R O F L U X C O R P O R A T I O N
PIPING INTERFACE CONNECTIONS
The filter piping should be installed as follows:
1. Installation of interconnecting piping
• When mating interconnecting fittings to the filter unit make sure that filter components are securely
held in place so no damage or leaks occur.
• If welding or soldering mating flanges or fittings make sure not to overheat filter components.
Overheating filter components can cause damage or leaks.
• If welding, DO NOT use the filter or its components as a ground.
2. Refer to Table ll on page 7 for piping connection sizes.
3. Run an influent line from the system or sump to the filter connection labled “INLET”. A service valve
and union should be installed in this line near the filter. If a pump or pre-strainer is provided, connect
the influent line to the flange labeled "INLET". Refer to specification drawings.
4. Run an effluent line from the filter return labeled "OUTLET" back to the system or sump. A service valve
and union should be installed in this line near the filter. Refer to specification drawings.
5. Run a waste line from the filter waste outlet labeled "WASTE" to the nearest sewer drain. Table II on
page 7 lists the minimum and maximum backwash flow rates and volumes for the PF-40 series filter. A union
should be installed in this line near the filter. Refer to specification drawings.
6. For filters utilizing a source other than the process system water for backwash supply, Table Il on page
7 shows the required backwash flow and volumes. The minimum backwash supply pressure is 20 psi and
the maximum backwash supply pressure for the PF-40 series filter is 50 psi. Run a line to the connection
labeled "BACKWASH." If public or municipal water is used for backwash, a backflow preventer is required
in this line on all units. A service valve and union should be installed in this line near the filter.
NOTE: If the filter inlet connection is located above the process liquid operating level, a foot or check
valve must be installed below the water level to prevent loss of pump prime.
PF-40 Series Filter (ver 8/21)
