Step 3.
Filter Tank Operation - Backwash Cycle
Reversing the flow of water through the filter bed and backwashing dirty water to the drain cleans
the filter bed. Raw water enters the filter control valve through the inlet port and is directed down the
distributor tube and out the lower distributor at the bottom of the tank, flowing upward through the
multimedia filter bed toward the top of the tank into the control valve. Water is then directed through a
specific flow restrictor and out the drain port to be discharged to drain.
Step 4.
Filter Tank Operation - Rinse Cycle
The rinse cycle packs the clean filter bed. Raw water enters the control valve through the inlet port
and is directed downward through the filter bed into the bottom distributor, up the distributor tube into
the control valve. Water is then directed through a specific flow restrictor and out the drain port to be
discharged to drain.
Operation Of Aeration Pump
The Sulfur-Cleer™ system introduces air into the media tank and bleeds off the old head of air
automatically. The exchange of the air into the media tank is controlled independently of the recharge
frequency of the filter media tank, allowing the air to be exchanged on a more frequent basis. During
an air exchange cycle, the air compressor pumps fresh air into the media tank and the air eliminator
solenoid exhausts the old air.
Iron and Trace Hydrogen Sulfide
When applying the filter on water sources with only iron present or with levels of hydrogen sulfide less
than 1 ppm, only backwashing will be needed to regenerate the filter. In some applications, odors
may develop over time and the media bed may need to be sanitized. In general, bleach will not be
required more than once per month and users generally find that it is needed no more than once every
four to six months, if at all.
Hydrogen Sulfide - Over 1 PPM
When applying the filter on water sources with hydrogen sulfide levels of 1 - 5 ppm, backwashing
every three days and eduction of diluted non-scented bleach on occasion may be needed.
Regeneration with bleach is only necessary when hydrogen sulfide is present in the product water.
Although the air compressor provides much of the action needed to reduce hydrogen sulfide, the
bleach will “super oxygenate” the Culligan CIM media to enhance effectiveness. Overdosing with
bleach will cause a faster breakdown of the media. Therefore, any chlorine dosing scheme involves a
compromise between media life and hydrogen sulfide reduction.
3
Introduction
(cont.)
