
801023188 F 09/19
How your Water
Filter Works CAUTION! The Iron-Cleer system must be supplied with cold water only.
Step 1
Aeration Operation Service Cycle
In the service cycle, raw water enters the inlet port of the aeration tank
and is directed through the inlet diffuser. The oxidation process begins
when the water passes through the inlet diffuser and cascades through
a head of air. This air/ water contact oxidizes the iron, manganese,
hydrogen sulfide in the water. The water is directed toward the bottom
of the tank and travels through the pick-up tube. It then passes through
the outlet of the aeration tank to the inlet of the filter tank. See Figure 1.
Filter Tank Operation Service Cycle
Raw water enters the filter tank through the inlet port of the filter control
valve. Upon system demand for filtered water, water is directed to the top
of the tank and flows downward through the multimedia filter bed toward
the lower distributor. Oxidized iron particles are trapped by the filter bed as
the water passes through. Filtered water enters the lower distributor and
travels up the distributor tube to the outlet port on the filter valve.
Step 2
Aeration Operation Air Recharge Cycle
When energized, the air pump sends air through the solenoid valve into one
end of the shuttle valve. Once air pressure in the shuttle valve is greater than
the water supply pressure at the other end of the shuttle valve, the piston shifts
to the open position. In the open position, the bleed-off port discharges excess
water and old air to the drain port through a flow restrictor. Simultaneously, the air
inlet port opens to provide a direct connection between the air pump and the top
of the aeration tank. The air pump runs for a preset period of time recharging the
head of air in the aeration tank. See Figure 2.
Air Recharge Shut Off
The timer turns power off to the air pump and the solenoid valve at the end
of the recharge cycle. The solenoid valve then closes the port between the
air pump and the shuttle valve. The port between the shuttle valve and the
atmosphere opens and releases air pressure. This allows water pressure to
shift the piston to the closed position. With the piston in the closed position,
the air recharge inlet port is closed and direct communication between the
bleed off tube and the drain port is also closed.
Timer Operation
A timer controls the air recharge cycle and how frequently it occurs. The timer simultaneously
energizes the air pump and the solenoid valve. After a preset amount of time, the timer shuts
off the air pump and de-energizes the solenoid valve.
Solenoid Valve Operation
The solenoid valve is a three-way valve having ports that connect to the air pump, shuttle valve and
the atmosphere. In the service cycle, the solenoid valve is de-energized and closes the port to the
air pump, providing a positive shut-off to the pump. This prevents water from backing up into the air
pump and damaging the pump. In the air recharge cycle, the solenoid valve closes the port to the
atmosphere and opens the port from the air pump.
Solenoid
Valve Shuttle
Valve
eration
Tank
Timer
Figure 1. Aeration Service Cycle.
Solenoid
Valve Shuttle
Valve
eration
Tank
Timer
Figure 2. Air Recharge Cycle.