Spectra Watermakers MEM-90,150 System Specifications, Testing The Performance Of The Membrane

SpectraPure®

	SYSTEM SPECIFICATIONS
Sediment Pre-Filter	0.5 micron MicroTec™ sediment pre-filter
Carbon Filter	0.5 micron carbon block pre-filter
RO Membrane Type	Thin-Film Composite (TFC)
DI Cartridges	MAXCAP DI ™
	SilicaBuster™ DI
Rejection Rate	Greater than 98% average
Input Water Pressure	60 psi (4.15 bar) line pressure*
Input Water Temp	77°F (25°C)
Recovery Rate	20% (i.e. 20% of the water will be
	collected as pure water)

Nominal Membrane Flow Rates @ 60 psi & 77° F :
GPD (lpd)	Product Water Flow Rate	Concentrate Flow Rate
90 (340)	235ml/min	940 ml/min
150 (340)	235ml/min	940 ml/min
300 (680)	470ml/min	1880 ml/min

Reverse Osmosis Membrane Feed Water Requirements

For the 1 year SpectraSelect TFC membrane pro-rated warranty to be honored, the following conditions must be met:

Operating Pressure*	40 – 80 psi (2.75 – 5.5 bar)
pH Range	3 – 11
Maximum Temperature	100° F (38° C)
Maximum Turbidity	1.0 NTU
Maximum Silt Density Index	5.0 (based on 15 min. test time)
Maximum Chlorine	less than 0.1 ppm
Maximum TDS	2000 ppm
Maximum Hardness	10 grains (170 ppm as CaCO3)
Maximum Iron	less than 0.1 ppm
Maximum Manganese	less than 0.1 ppm
Maximum Hydrogen Sulfide	0 ppm
Langlier Saturation Index	LSI must be negative

*Operating pressure less than 40 psi will require a booster pump:

less than 49 GPD use BPLF-MO-115(-230), more than 49 GPD use BPHF-MO-115(-230).

*Operating pressure greater than 80 psi will require a pressure reducing valve.

	SpectraPure®Inc. 480.894.5437 Call us toll-free 1.800.685.2783
4	2167 East Fifth St, Tempe, Arizona 85281

SpectraPure®

TESTING THE PERFORMANCE OF THE MEMBRANE

Membrane Output Calculation

Membranes produce the rated gallons per day (GPD) at 60 psi (4.1 bars) operat- ing pressure, 77°F (25°C) operating temperature and 500 ppm total dissolved solids.

Membrane output gallons per day (GPD) depends on operating pressure, water temperature and the ppm TDS in the feed water.

Expected GPD = Rated GPD × PCF × TCF

PCF is the pressure correction factor

TCF is the temperature correction factor

Calculation of Pressure Correction Factor (PCF): The output (GPD) from the membrane is directly proportional to the applied pressure.

Note: The membrane is rated to produce the rated GPD at 60 psi. For any pres- sure other than 60 psi the output GPD is multipled by the PCF.

PCF = Line Pressure (in psi) ÷ 60

Calculation of Temperature Correction Factor (TCF): The output (GPD) also decreases with decrease in temperature. This is because water viscosity increases with decrease in water temperature.

Temperature Correction Factor Table (TCF)

°F /°C		TCF	°F \°C	TCF	°F \°C	TCF
41.0	/5	0.521	59.0 /15	0.730	77.0 /25	1.000
42.8	/6	0.540	60.8 /16	0.754	78.8 /26	1.031
44.6	/7	0.560	62.6 /17	0.779	80.6 /27	1.063
46.4	/8	0.578	64.4 /18	0.804	82.4 /28	1.094
48.2	/9	0.598	66.2 /19	0.830	84.2 /29	1.127
50.0	/10	0.620	68.0 /20	0.857	86.0 /30	1.161
51.8	/11	0.640	69.8 /21	0.884	87.8 /31	1.196
53.6	/12	0.661	71.6 /22	0.912	89.6 /32	1.232
55.4	/13	0.684	73.4 /23	0.941	91.4 /33	1.267
57.2/14		0.707	75.2 /24	0.970	93.2 /34	1.304

SpectraPure®Inc. Fax 480.894.6109 Fax us toll-free 1.877.527.7873 E-mail: spectra@spectrapure.com Visit us on the web www.spectrapure.com 21