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Operating conditions
The original Iron Curtain System has been validated by
the WQA under their S‑200 Filter Standard for the reduc-
tion/removal of iron, manganese, and/or hydrogen sulfide.
The concentration limits listed below reflect the maximum
individual limit that each contaminant was tested for sepa-
rately without any interference of other contaminants in the
influent water.
In reality, these contaminants may be present in combination
which may limit the filter's ability to remove these contami-
nants in higher concentrations. In some cases, individual
sellers of this equipment have had success removing higher
concentrations of contaminants—iron, for example—above
the limitations we have listed. If you are considering the
installation of this system for the reduction/removal of iron,
manganese and/or hydrogen sulfide levels that are above
operating conditions listed below, we recommend that you
consult your dealer for proper application. Installation of this
system under these circumstances may void part(s) and/or
all of the system warranty.
pH — The pH level of the influent water must be 7.0 or higher
for iron oxidation reaction to proceed per the engineering
specifications.*
Iron — This system is rated for a maximum of 10 ppm of
ferrous (clear water) and/or ferric (red water) iron.*
Iron bacteria — If iron bacteria are present; more frequent
service may result, life of the Iron Curtain system may be
limited and the system may be unable to properly remove
iron. By properly controlling the iron bacteria with chlorine
or other approved methods for bacterial reduction, the
Iron curtain System will function properly. One option
to control iron bacteria within the Iron Curtain is chlo-
rine injection during the regeneration cycle. In some
instances, continuous chlorination of the water supply
may be needed.
Hydrogen Sulfide — Sometimes referred to as "rotten
egg" odor. This system is rated for a maximum of 10 ppm
hydrogen sulfide. Hydrogen sulfide levels vary depending
on barometric pressure.*
Manganese — Limit 2.0 ppm; amounts present over 2.0
ppm may gradually prevent iron removal. Note: For optimum
manganese reduction, pH should be greater than 8.5.*
Organic Matter (Tannins) – The presence of organic matter
such as tannins will prevent the oxidation process of convert-
ing the dissolved element, such as iron or manganese, to a
nonsoluble precipitate or solid substance. In other words,
organics can tie up the iron preventing filtration. The pres-
ence of organics such as tannins above 0.5 ppm voids
any claims for this system to perform as stated above.
In some applications, tannin levels below 0.5 ppm or the
presence of other organics may hinder the operation of
this system.*
chlorine — The presence of chlorine in the raw water supply
ahead of this system should be limited to a maximum of 1.0
ppm residual and 0.5 ppm or less when fed continuously.
Total dissolved Solids (TdS) — While TDS does not directly
affect iron removal, it is a good indicator of potential interfer-
ence. Most waters have TDS less than 500 and generally
present no problems to iron reduction. If any ion becomes
excessive, it may cause failure of iron removal. a TdS more
than 750 ppm voids any claims for this system to perform
as stated above.*
4
Pre-Installation check list
Water Pressure: A minimum of 30 psi at a predetermined
continuous flow rate is required to backwash the filter properly,
with a maximum of 70 psi to be used.*
Actual Influent Flow Rate: (Water available from well pump,
service inlet, etc.) The actual flow rate must exceed the back-
wash rate for the model of filter selected at a minimum of 30
psi for the entire length of the backwash cycle. See actual
backwash rates in the Specifications section on page 6.
electrical requirements for filter control: A continuous
110 volts is required to cycle the controls and aeration pump.
Make certain the electrical supply is always on and cannot be
turned off with another switch.
Existing Plumbing: The condition of the existing plumbing
should be free from lime and iron build‑up. Piping that is heavily
built‑up with lime and/or iron should be replaced.
equipment location: See Figure 1,on page 7.
location of aeration and filter Tank: See Figure 1 on page
7. These two tanks should be installed after the pressure tank
and as close to each other as practical. If you want to filter
outside hosebibs, be sure the filter system is properly sized
to handle the flow rates required for extended periods of time,
in addition to the normal household demand.
drain lines: All filter system drain lines must be a minimum
of 3/4" or equal to the size of the drain line connection at the
control valve or larger. Avoid overhead drain lines when pos-
sible. If used, overhead drain lines are not to exceed a height
of five feet above the control valve and should be no more
than fifty feet in length.
check Valve: On applications where there is a non‑filtered
demand for water such as joint wells (where the filter system is
only installed in one of two or more homes), outside hosebibs,
farms with outbuildings, yard hydrants, etc. a spring loaded
check valve is provided and must be installed ahead of the
aeration tank. See Figure 1, on page 7. Install the check valve
in a vertical upflow position with a minimum 6" water column
above the check valve. This prevents air from escaping past
the check valve. If the check valve is installed in a horizontal
position, and there is a simultaneous demand for both non‑
filtered and filtered water, the air head in the aeration tank may
escape backwards past the check valve into the non‑filtered
water line.
by-Pass Valves: Always provide for a bypass on the filter
system. It is recommended that a bypass be placed on both
the aeration tank and the filter tank.
filtered Water: Normally, filtered water is furnished to all
household lines; however, outside faucets are typically left
on raw water. If filtered water is provided to outside faucets,
the filter system must be sized accordingly.
caution: The water pressure is not to exceed 70 p.s.i.; water
temperature is not to exceed 110° F; filter system cannot be
subject to freezing conditions; filter system cannot be subject
to a negative pressure or vacuum. On installations where there
is the possibility of a negative pressure or vacuum, a vacuum
breaker or check valve must be installed at the inlet of the
conditioner. For example, if the water service is interrupted
due to a water pipe break, well pump being serviced, etc., a
back siphon could occur causing a vacuum or negative pres-
sure on the filtration equipment.
*For application parameters outside the specified operation
conditions or additional information regarding the listed
items, contact your dealer.
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