US Water Systems 220-USCRO-200FR, User Manual

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5
System Safety

DO NOT USE WHERE THE WATER IS MICROBIOLOGICALLY UNSAFE OR OF UNKNOWN
QUALITY WITHOUT ADEQUATE DISINFECTION BEFORE OR AFTER THE SYSTEM.

PRETREATMENT MUST BE SUFFICIENT TO ELIMINATE CHEMICALS, ORGANICS OR INOR-
GANICS THAT COULD ATTACK THE MEMBRANE MATERIAL

ALWAYS SHUT OFF THE FEED WATER AND RELEASE THE PRESSURE BEFORE WORKING
ON THE UNIT.

NEVER ALLOW THE UNIT TO FREEZE OR OPERATE WITH A FEED WATER TEMPERATURE
ABOVE 100°F.
Rejection, Recovery and Flow Rates
US Water Systems 200 GPD Economy Reverse Osmosis Systems are designed to produce permeate water at
the capacities indicated by the suffix in the system’s name under the aforementioned conditions. For example, the
US Water Systems 200 GPD Reverse Osmosis System produces 200 gallons per day of permeate water at the
listed operating test conditions.
The amount of total dissolved solids (TDS) rejected by the membrane is expressed as a percentage. For example, a
98.5% rejection rate means that 98.5% of total dissolved solids do not pass through the membrane. To calculate the %
rejection, use the following formula:
% Rejection = [(Feed TDS – Product TDS) / Feed TDS] x 100
Example:
98.5% = [(550-8.25)/550] x 100
NOTE: ALL TDS FIGURES MUST BE EXPRESSED IN THE SAME UNITS, TYPICALLY PARTS PER MILLION
(PPM) OR MILLIGRAMS PER LITER (MG/L).
US Water Systems 200 GPD Reverse Osmosis Systems are designed to reject up to 98.5% NaCl, unless comput-
er projections have been provided or stated otherwise.
The amount of permeate water recovered for use is expressed as a percentage. To calculate % recovery, use the
following formula:
% Recovery = (Product Water Flow Rate / Feed Water Flow Rate) x 100
Example:
28% = (0.14/0.50) x 100
NOTE: ALL FLOW RATES MUST BE EXPRESSED IN THE SAME UNITS, TYPICALLY GALLONS PER MI-
NUTE (GPM).