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Water Management Systems and Products Page 15
The Model SGM-250P backwashes based upon pressure
differential across the filter media. Additionally, an adjustable
timer allows back washing for up to five minutes. The factory
setting is four minutes.
The pressure differential switch is adjustable for pressure drop and
dead band. Backwash will start when the pressure differential
reaches set point plus the dead band. For example, if the pressure
differential is set for 6 psi, the dead band for 4 psi, and the
backwash timer for 4 minutes, then the backwash cycle will start at
10 psi for a duration of four minutes.
Replacing Sand and Gravel
Replace the sand and gravel every two years, when contaminated,
or when sand has carried over from excessive water flow.
There are three layers of filter media. First, starting from the
bottom, place 200 lbs. of ½” x ¼” round gravel. Second, place 300
lbs. of ¼” x 1/8” round gravel and third, the top final layer, place
700 pounds of #20 filter sand.
Anode Replacement
On top of the filter housing is a sacrificial anode made of
magnesium. Inspect and replace when it has depleted.
5-2 Centri-Separator System
The CSM-150 and CSM-400 require a 120/1/60-power source and
are provided with a standard plug. The separators are designed to
operate to a prescribed flow range for maximum solid removal.
The CSM-150 operates at a flow rate of 10 to 20 gpm and the
CSM-400 operates at 45 to 70 gpm. Liquid enters the upper portion
of the separator housing tangentially and the solids are drawn
through internal slots to the bottom chamber. An electrically
operated ball valve automatically back flushes the solids from the
separator. Periodically inspect and ensure that the purge line is
clear to flow freely.