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1AAN WaterMax
®
Iron Filter Sizing Formula
Iron Filter and Potassium Permanganate Feeder Installation Guide
The iron filter may be programmed to regenerate every one to twelve days. Select the frequency based on the amount of
iron in the water and the number of people in the household.
For optimum performance, program the water softener to
regenerate first, followed by the Iron Filter.
Example:
Softener 1:00am; Iron Filter 3:00am.
Regeneration Cycle Frequency Worksheet
This table will help you determine how often the iron filter will need to regenerate.
Important:
The iron filter is capable of treating a combination of undesirable constituents in the water (iron, manganese,
and/or hydrogen sulfide). However, the filter must be applied within the operating limits stated in the
Filter Specifications
in
this manual. Failure to comply with these specifications will degrade performance and possibly cause the control valve to
malfunction.
Note:
The iron filter should be installed after the pressure tank or water meter and before the water heater or any water
softener appliance, unless otherwise recommended. See Figure 6. A minimum 3/4-inch pipe is required for proper function
of the filter. Examine the inlet piping to make sure the pipe is not plugged with lime or iron. If the piping is plugged, it must
be cleaned or replaced.
Determine Monthly Usage
This table will help you determine how much regenerant the iron filter will use each month.
Water
Example
Total Iron
___ ppm (mg/L) x 1 =
___ ppm (mg/L)
3.5 ppm (mg/L) x 1 =
3.5 ppm (mg/L)
+ Manganese*
___ ppm (mg/L) x 3 =
___ ppm (mg/L)
0.2 ppm (mg/L) x 3 =
0.6 ppm (mg/L)
+ Sulfur
___ ppm (mg/L) x 5 =
___ ppm (mg/L)
1.0 ppm (mg/L) x 5 =
5.0 ppm (mg/L)
= Total compensated ppm
___ ppm (mg/L)
9.1 ppm (mg/L)
x Gallons per day for one
person
75 gallons (284 L)
75 gallons (284 L)
= ppm per person per day
=
___ ppm (mg/L)
682.5 ppm
x Number of people in house-
hold
____ people
4 people
= Daily ppm capacity
___ ppm (mg/L)
2730 ppm
Iron filter capacity
=
10,000 ppm
10,000 ppm
÷ Daily ppm requirements
=
____ ppm
2730 ppm
= Frequency of regeneration
____ days
3.6 days
Set regeneration frequency
@
____ days
3 days
* If manganese is unknown, multiply the iron and sulfur total by 1.15 to adjust total compensated ppm.
Water
Example
Total days per month
____ days
30 days
÷ Frequency of regeneration
____ days
3 days
= Regenerations per month
____ regenerations
10 regenerations
x 4 oz (118 g) per regeneration = oz
KMnO4 per month
____ oz
4 oz (118 g) x 10 regenerations = 40 oz (1.1 kg)
÷ 16 = lb per month
____ lb
40 oz (1.1 kg) ÷ 16 oz/lb (1 kg/kg) = 2.5 lb (1.1 kg)*
Figure 6: Iron Filter and Potassium Permanganate Feeder Placement
Step 1
Step 2
Install Filter
A.
Follow steps 1–3 of Installation Steps and Start-Up Procedures.
B.
Instead of connecting the brine tank, connect the potassium permanganate feeder as outlined below.
Unpack Feeder
A.
Remove feeder from shipping carton.
B.
Read the instructions in red, remove the label from the feeder, and discard it into the shipping carton.
C.
See Figure 6 for feeder placement.
D.
Remove the cover and set it aside.
E.
Pull up on the brine well cap to remove the safety shutoff assembly. Remove the rubber band from the
air check/draw tube float rod assembly and replace the safety shutoff back into the brine well.
F.
Remove the plastic bag containing the three stainless steel screws and the 3/8-inch tubing.
