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Pre-installation Instructions (cont.)
Successful Application
Any filter media may have specific limitations and/or requirements for successful application. A water sample
should be submitted to First Sales for analysis and recommendation by Customer Service.
FBW ARSENIC IMPORTANT: Contact First Sales technical services to assist with proper
sizing based on the level of arsenic in the water and the flow rate requirement. The arsenic
test results must be from a certified laboratory to ensure accuracy. Other water quality
information is required as well, and will determine if pre-treatment equipment is required to
meet the influent water quality pre-requisites for the FBW ARSENIC system: Iron < 0.3 ppm,
Manganese < 0.05 ppm, pH < 8.0, Silica < 30 ppm, Hardness > 5 gpg is preferred but not
required.
Once the system has been installed, an arsenic test should be done to determine if the
arsenic level is being reduced sufficiently (10 ppb or less, per the EPA MCL) and should be
tested regularly (every 6 months recommended) to ensure the system is functioning properly
and to indicate when the media has become exhausted.
Time of Backwash
Periodically the control valve will go through a backwash cycle. This cycle is factory preset to 12:00 A.M.
flushing the accumulated sediment and/or precipitant to the drain. After the backwashing process the unit is
now prepared for the next period of service.
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
FBW or FBW ARSENIC system.
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)
Cycle Time (seconds)
Example:
8 gallons
65 seconds
X
60
=
Pumping Rate (gallons per minute)
Draw down is 8 gallons
Cycle time is 65 seconds
X
60
=
7.4 gpm (gallons per minute)
3
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