Hydroid – Series User Manual
22 04/19
REJECTION, RECOVERY AND FLOW RATES
MEMBRANE PERFORMANCE
Hydroid reverse osmosis systems are designed to produce 3,000 GPD of PRODUCT water
(purified water) at a minimum of 98%+ rejection under the proper conditions.
REJECTION
The amount of total dissolved solids (TDS) rejected by the membrane is expressed as a
percentage. Hydroid reverse osmosis systems are designed to reject up to 98%+ NaCI
depending on feed water chemistry. A 98%+ rejection rate means that 98% of total dissolved
solids do not pass through the membrane. To calculate the percent of rejection, use the
following formula:
Percent of Rejection = [(FEED (inlet) TDS – PRODUCT (purified water) TDS) / Feed TDS] x
100
Example: [(550 PPM FEED (inlet) water TDS – 11 PPM PRODUCT (purified water) TDS) / 550]
x 100 = 98%+
ALL TDS FIGURES MUST BE EXPRESSED IN THE SAME UNITS, TYPICALLY PARTS
PER MILLION (PPM) OR MILLIGRAMS PER LITER (MG/L).
RECOVERY
The amount of PRODUCT water (purified water) recovered for use is expressed as a
percentage. To calculate percent of recovery, use the following formula:
Percent of Recovery = (PRODUCT (purified water) Water Flow Rate / FEED (inlet) water flow
rate) x 100
For Example, if the Hydroid makes 2.0 GPM PRODUCT (purified water) and has a FEED (inlet)
flow of 2.66 GPM.
(2.0 GPM PRODUCT (purified water) flow / 2.66 GPM FEED (inlet) flow) x 100 = 75%
ALL FLOW RATES MUST BE EXPRESSED IN THE SAME UNITS, TYPICALLY GALLONS
PER MINUTE (GPM).
THE MEMBRANES MUST BE FLUSHED FOR AT LEAST 30 MINUTES.
DISCARD ALL OF THE PRODUCT (PURIFIED WATER) THAT IS PRODUCED
DURING THE FLUSH PERIOD.
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