PUROFLUX
C O R P O R A T I O N
SAMPLE SPECIFICATION: PF -50 SAND MEDIA FILTER
Filtration system to be a factory assembled package with control panel, control valves, face piping, and electric actuator. Unit
shall be a PUROFLUX model PF-50__ designed for a maximum flow rate of __ gpm. The filter system shall utilize tower
water for the backwash supply. The filter package shall be constructed as follows:
VESSEL:
Vessels shall be of non-code carbon steel construction; fusion bonded epoxy lining/polyester exterior coating and designed for
150 psi service. Vessels to be hydro tested at 1.5 times design pressure and be equipped with a manual & automatic air relief
valve. The vessels shall be equipped with epoxy coated carbon steel handhole located in the top head and handhole located in
the tank side shell, (1) 3/4" drain and vent connection located in the lower/upper head.
MEDIA:
Filter shall be supplied with a uniformly grade silica sand media, rated to remove suspended solids down to 5 micron at 90%
efficiency.
INTERNALS:
The filter units shall have a removable underdrain laterals constructed of 304-stainless steel, with a 3-point distribution
overdrain constructed of Sch. 80 PVC (304-stainless steel available upon request for hot water applications) for even flow
across the filter media. The filter shall have an ABS drain screen installed at the bottom of filter vessel in order to keep media
from draining when the vessel drain plug is removed.
ACTUATOR & VALVES:
The filters shall be equipped with a dual electric valve actuator system. Control valves shall be (2) 3-way bronze ball valves (for 12”
to 30” units) or (4) positive sealing lug-style butterfly valves (for 36” and 42” units), mechanically linked in a master/slaved
configuration. Influent/effluent and backwash/waste valves shall alternately change position when a backwash cycle is initiated to
reduce water hammer and avoid contamination. Upon completion of the backwash cycle all valve will alternately move
simultaneously back into the filter mode positions.
(Optional) PUMP & MOTOR/PRE-STRAINER:
Pump shall be cast iron bronze fitted, close couple end suction type centrifugal with cast iron pre-strainer with removable
stainless steel basket. Motor to be standard efficiency, TEFC and rated for ___VAC, ___ Hz. Pump will be rated to deliver __
GPM @ 50’ TDH.
(Optional) PIPING:
All Interconnecting piping to be completed using SCH. 80 PVC.
(Optional) STRUCTURAL SKID:
Filter package shall be assembled and contained on steel skid. Skid shall be designed to support the filter vessel, pump, and
piping. The structural skid shall be fusion bonded polyester coated.
CONTROLS:
Filter to be supplied with (Manual/Automatic) controls

Manual units: Filter to be supplied with manual linkage handle to initiate/terminate the backwash cycle. All
electrical to supplied by others.

Automatic Units: Filter to be supplied with automatic controls, consisting of a Nema 4X enclosure, door
disconnect switch, motor and circuit overload protection (for units with optional pump), electric valve actuator,
step-down transformer, adjustable solid state backwash timer, and 24-hour backwash time clock. Filter shall
have a single electrical hook-up point.
PUROFLUX Corporation • (805) 579-0216 • Fax (805) 579-6005
Rev. 01/10