Watts R24-12-1111000 - Manual (Page 7)

recommended.
Iron & Manganese - These foulants should be removed to less than 0.1 ppm. Special media
filters and/or chemical treatment is commonly used.
pH - The pH is often lowered to reduce the scaling potential.
Silica: Reported on the analysis as SiO2. Silica forms a coating on membrane surfaces when
the concentration exceeds its solubility. Additionally, the solubility is highly pH and
temperature dependent. Silica fouling can be prevented with chemical injection and/or
reducing the recovery.
II.
CONTROLS, INDICATORS, and COMPONENTS (see figure 1)
A. Controller - Controls the operation of the system and displays the product water
quality. There are three controllers available. Controller # 1 has an on/off switch and
an input for tank level. Controller # 2 has an on/off switch, tank level input, low
pump suction pressure shutdown, and a product water TDS meter. Controller # 3 is
the CI1000 (shown).
B. Reject Control Valve - Controls the amount of reject flow. If the reject recycle option
is included, two reject control valves will be present.
C. Pump Discharge Valve - Used to throttle the pump.
D. Prefilter Pressure Gauges - Indicates the inlet and outlet pressure of the prefilter. The
difference between these two gauges is the prefilter differential pressure.
E. Pump Discharge Pressure Gauge - Indicates the pump discharge pressure.
F. Reject Pressure Gauge - Indicates the reject pressure.
G. Reject Flow Meter - Indicates the reject flow rate in gallons per minute (gpm). If the
reject recycle option is included, two reject flow meters will be present.
H. Product Flow Meter - Indicates the product flow rate in gallons per minute (gpm).
I. Prefilter Housing - Contains the RO prefilter.
J. Automatic Inlet Valve - Opens when pump is on and closes when the pump is off.
K. Low Pressure Switch - Sends a signal to the controller if the pump suction pressure is
low. Included only with controller option # 1 & 2.
L. RO Feed Pump - Pressurizes the RO feed water.
M. RO Membrane Vessels - Contains the RO membranes.