Ferrous Iron And Compensated Hardness - A.O. Smith Pro AOW-S400 Owner's Manual

INSTALLATION GUIDE

FERROUS IRON AND COMPENSATED HARDNESS

2
Ferrous Iron
NOTICE: If the water supply contains ferrous iron, a commercially available resin bed cleaner should
be used every six months. Follow the instructions on the container. You should increase your water
hardness setting by 5 grains per gallon (86 mg/L) for every 1 ppm (1mg/L) of ferrous iron.
Ferrous Iron
(a/k/a clear water or dissolved iron)
Organic Iron or Bacterial Iron
Colloidal Iron
Determine Your Compensated Hardness
Compensated Hardness is the amount
of ferrous iron present in the water as
well as hardness content.
To determine compensated hardness
in standard measurements you should
increase your water hardness setting by
5 grains per gallon (86 mg/L) for every
1 ppm (1mg/L) of ferrous iron.
Use the section below for guidance
and fill in the blank chart below to
determine your Compensated Hardness.
Use this blank chart to determine your Compensated
Hardness using standard measurements.
Description
Actual Hardness
(use your test
results for
hardness)
Ferrous Iron
(x5 for standard)
or (x86 for metric)
Compensated
Hardness (add first
two results for
final result)
Iron
Ferric Iron
Results
+
=
Only type of iron that can be treated with a
water softener.
Insoluble and the particles can eventually foul
a resin bed. It should be filtered out before the
water reaches the softener.
Attached to other organic compounds in the
water. Additional treatment is needed to
remove this type of iron.
Not dissolved, yet stays in suspension. A
softener cannot remove this type of iron.
Standard Example
This example uses 3 (ppm or mg/L) of
ferrous iron present in the water.
Description
Actual Hardness
*Ferrous Iron
times five (x5)
Compensated
Hardness (20+15)
*Add five times (x5) the iron content in ppm or mg/L
to the actual hardness
Metric Example
This example uses 3 (ppm or mg/L) of
ferrous iron present in the water.
Description
Actual Hardness
*Ferrous Iron
times eighty-six
(x86)
Compensated
Hardness
(342+258)
*Add eighty six times (x86) the iron content in ppm
or mg/L to the actual hardness
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Description
Results
20 (gpg)
15
35
Results
342 (mg/L)
258
600
5