3
Water Supply
This filter will function properly when the water supply is furnished by a jet pump, submersible pump, variable
speed (constant pressure) pump or community water supply. As with all other filter systems, however, it is
imperative that the well pump provides enough flow rate for the filter to adequately backwash. In order to
ensure sufficient backwash flow rate the following pumping rate test should be performed prior to installing the
NBW/NEBW.
1. Make certain no water is being drawn in the house.
2. Open spigot nearest pressure tank.
3. When well pump starts, close spigot and measure time (in seconds) to refill pressure tank (well pump
turns back off). This is
Cycle Time
.
4. Using a container of known volume, draw water from pressure tank and measure how many gallons
until the pump turns back on again. This is
Draw Down
.
5. Calculate pumping rate by dividing draw down by cycle time and multiplying by 60.
Draw Down
(gallons)
X 60
=
Pumping Rate (gallons per minute)
Cycle Time
(seconds)
Example:
Draw down is 8 gallons
Cycle time is 65 seconds
Location Considerations
The proper location to install the NBW/NEBW will ensure optimum filter performance and satisfactory water
quality. The following factors should be considered in selecting the location of this system.
1. The NBW/NEBW must be installed after the pressure tank (private well system only).
2.
The system should be installed as close as possible (preferably within 15’) to an adequate floor or
laundry drain capable of handling the backwash cycle volume and flow rate (refer to unit
specifications). An air gap should be provided between the NBW/NEBW drain line and plumbing
drain.
3.
All water conditioning equipment should be installed at least 10’ prior to the water heater. Water
temperatures exceeding 100°F can damage the internal components of the control valve and filter
tank. An expansion tank may need to be installed in the line to the water heater in order to allow for
thermal expansion and comply with local plumbing codes.
4. Water pressure must not exceed the range of 25 - 100 psi.
5. The system must not be subject to freezing temperatures.
6. The control valve requires 115/120 V, 60 Hz electricity from a three prong outlet that is not wired to
a switch.
7. Never install a cartridge type filter prior to the NBW/NEBW. Any cartridge or in-line filter (if desired)
may be installed after the NBW/NEBW system. This will prevent restricting the water flow and
pressure available for backwash.
8. Appliances requiring extended periods of continuous or high flow water use (i.e. geothermal heat
pumps, swimming pools, lawn irrigation, outside hose bibs, etc.) should bypass the filter.
8 gallons
X 60 =
7.4
gpm (gallons per minute)
65 seconds
Pre-Installation Instructions
