Pentek FreshPoint U440 Service Manual page 9

Backflush Kit Installation
Installations with high fouling potential will require plumbing in a pressurized surge tank and inlet solenoid
valve (See Flushing Schedule Table 1). In the backflush mode, the filtered water from a pressure tank flows
backward through the membrane from the filtrate side during the flushing cycle. This removes the foulant from the
membrane surface as well as material that may have entered into the porous structure.
Connect the FreshPoint™ to the plumbing supply as shown in Figure 2. It is recommended that the plumbing
include a system bypass for future servicing, etc. A 200 um sediment pre-filter is recommended. For ease of
membrane element replacement, unions are recommended as indicated on Figure 2. The backflush tank should
be installed on a tee before the flow meter. The backflush tank precharge pressure should be set to 20 psig.
NOTE: Installation of the backflush tank after the meter will cause reverse flow through the meter and
could have a detrimental effect on meter performance.
Outlet Valve
Outlet
Inlet
Bypass Valve
Inlet Valve
Pre-filter (Recommended)
Figure 2: Backflush Kit Installation
Drain Flow Control
(Note Flow Direction)
Piping Must
Code-Compliant
Backflush Inlet Shut-Off Valve
1/4" Ball Valve Pressure Tap
for Membrane Integrity Testing
(Recommended)
Installation Instructions
Flow Meter Housing
(Note Flow Direction)
Drain
Include
Air Gap
Tank Isolation Valve
42606_REVA
Page 9