SECTION 5: BACKWASHING INSTRUCTIONS
Periodic Backwashing (Regeneration) of the Iron Reduction System bed is required to fl ush out the entrapped iron that has accumulated. This procedure is performed
automatically at 1:00 a.m. for a period of approximately 10 minutes and will not interfere with a softener regeneration, which is usually set for 2:00 a.m.
TO SET BACKWASH FREQUENCY FOR NORMAL HOUSEHOLD APPLICATIONS:
To determine and set Backwash Frequency, follow these instructions:
1)
Select Backwash Frequency Schedule corresponding to your model (page 3-7 and 3-8).
2)
Locate box intersected by number of persons in your family and iron concentration of water (if iron concentration is between two numbers in Schedule,
use higher number.)
3)
Number in box represents number of days, between regenerations. Refer to How to Change Days Between Regeneration on page 3-9.
Example: You have model APIF100, 4 people in family, and 8 ppm iron. Refer to Schedule for model APIF100 and locate box intersected by 4 in family and 8 ppm iron. The
fi gure indicates the number of days between each regeneration period.
IMPORTANT NOTE
The Backwashing Frequency Schedules are based on average water consumption rates and are merely guides. They are NOT intended to be used if
water is used by outside spigots, a swimming pool, geothermal heat pump, or other high water usage devices or activities. If your application includes
any of these, and you have already determined your model Iron Reduction System is capable of handling the fl ow rates involved, refer to the next
paragraph for instructions on setting Backwash Frequency.
TO SET BACKWASH FREQUENCY FOR COMMERCIAL MODELS AND
NON-STANDARD HOUSEHOLD APPLICATIONS:
If your fi lter is to be used for a commercial application or for reasons covered above, the Backwashing Frequency Schedule is not applicable.
Determine the backwashing frequency as follows:
1)
Estimate Daily Iron Reduction by multiplying iron concentration by estimated daily water consumption (use 60 gallons per person per day for normal
household
applications):
Est. Daily Water Usage ______ gal. X Iron Concentration ______ ppm =
Daily Iron Reduction ______ (ppm - gal.)
2)
Calculate Backwash Frequency by inserting Daily Iron Reduction from above into following formula (refer to specifi cations for Iron Reduction Capacity
of your model):
Iron Reduction Capacity of Model ______(ppm-gal.) ÷ Daily Iron Reduction ______ (ppm - gal.) =
Backwashing Frequency ______ days
If your water contains high iron concentration, manganese, tannins, or hydrogen sulfi de, it may be advisable to increase the backwash frequency to daily, if neces-
sary. It should be noted, however, that increasing the frequency or duration of backwashing WILL NOT overcome an insuffi cient pumping rate.
5-1
Summary of Contents for APIF100
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