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SECTION 2 .owYourWATERFILTE.WORKS
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2B. IRON IN WATER/HOW FILTER REMOVES IT
IMPORTANT:
Sears water filters are sometimes installed alone in the water system, but most often other water treat-
ing equipment is needed. Always be sure to have your water tested by a qualified testing laboratory.
If you need help, ask at your Sears store, or call Sears Water Line, 1-800-426-9345.
Iron in water causes many problems, from mak;ng
rust stains on clothing, plumbing fixtures, etc. to
making food and beverages look and taste bad. Two
common kinds of iron are --
-- Clear Water (FERROUS) iron is the most com-
mon. Water with ferrous iron isclear when taken from
a faucet. After standing for 15 to 30 minutes, the
water turns to a yellow or brown color.
-- Red Water (FERRIC) iron is rusty or brown as it
comes out a faucet.
Your Sears Automatic Iron Filter will remove up to 20
parts per million (ppm) of the ferrous and/or ferric
kinds of iron. Sears advises you to install a water
softener in the water system after the iron filter, to
remove any iron that may get through the filter.
NOTE:
Bacterial iron is another common kind. It forms
stringy mud-like clumps in the water. If you think you
have bacterial iron, have a water sample tested by
Sears Water Analysis Laboratory. They will tell you
what is needed to treat the bacterial iron. THIS
FILTER WILL NOT REMOVE BACTERIAL IRON
FROM WATER.
The iron filter is filled with a special manganese
coated mineral. The filtering mineral bed is made up
of thousands of small, odd-sha_=d, pebble-like pieces.
The mineral does 2 things;(._ OXIDIZES iron and,
(_) FILTERS iron.
(_) OXIDIZE -- Iron most often is dissolved (clear
water iron) in water supplies. You can't see it and, in
this form, it is not filterable. When clear water iron
comes in contact with oxygen for a few minutes, the
iron changes to a solid form (red water iron) that you
can see. The filtering mineral gives offthe oxygen to
make the iron change (oxidize) to red water iron.
(_) FILTER -- Iron, in the oxidized or red water form,
is filtered and held within the mineral bed during
sewice. The iron is then cleaned from the mineral
bed during_with a potassium permanganate
solution, and backwashing.
SERVICE (FIG. 6) -- The water supply, with iron in it,
flows into and downward through the filter. The
mineral bed in the filter oxidizes, gathers and holds
the iron. Clear, iron-free water goes out the filter and
to the house pipes.
RECHARGE -- Intime, the filtering mineral has given
off all the oxygen it can, and the bed is filled with the
iron it has gathered. Then the mineral needs a
recharge (or regeneation) to give it a new oxygen
supply and to clean the iron out. FILL, SOLUTION
DRAW/RINSE, BACKWASH and FAST RINSE are
stages of the recharge, FIG. 7.
FILL water flows to a bottle filled with potassium
permanganate powder during the first stage of
recharge. The bottle fillswith water toa preset level,
until stopped by a float shutoff. In the bottle, water
dissolves some of the potassium permanganate
powder so a solution is ready for the solution draw
cycle. The fill cycle lasts for 4 minutes.
During the 80 minute SOLUTION DRAW/RINSE,
potassium permanganate solution ispassed through
the filter mineral to replace the oxygen. A suction
takes the solution from the bottle and puts it into the
mineral tank. The potassium permanganate rinses
slowly through the filtering mineral, then goes out of
the filter to the drain.
12
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