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Watts®residential membranes (thin film composite)
Part Number Application O.D. Length Capacity No. Per
(GPD) Case
W-1812-24 Tap water 1.8” 11.75” 24 25
W-1812-36 Tap water 1.8” 11.75” 36 25
W-1812-50 Tap water 1.8” 11.75” 50 25
W-1812-75 Tap water 1.8” 11.75” 75 25
W-1812-100 Tap water 1.8” 11.75” 100 25
Note: W-1812-100 membranes are packaged in preservative and should be kept in a cool environment if stored for a prolonged period of time.
Watts membrane specifications
Data W-1812-24 W-1812-36 W-1812-50 W-1812-75 W-1812-100
Membrane type TFC TFC TFC TFC TFC
Material Polyamide Polyamide Polyamide Polyamide Polyamide
Charge Negative Negative Negative Negative Negative
Configuration Spiral-wound Spiral-wound Spiral-wound Spiral-wound Spiral-wound
Salt rejection 96% 96% 96% 96% 96%
Max. operating temp. 113˚F / 45˚C 113˚F / 45˚C 113˚F / 45˚C 113˚F / 45˚C 113˚F / 45˚C
Max. operating pressure 125 psi 125 psi 125 psi 125 psi 125 psi
Max. turbidity (NTU) 1 1 1 1 1
Max. SDI 5 5 5 5 5
pH range 3-10 3-10 3-10 3-10 3-10
Flux 24 gpd 36 gpd 50 gpd 75 gpd 100 gpd
Note: Specifications based on 77˚F (25˚) temperature and 60 psid pressure.
Dimensions: A = 0.67”; B = 0.87”; C = 11.8”; D = 1.77” and E = 0.87”.
Watts®membranes
We offer a complete line of residential and commercial membranes for tap, brackish and sea
water applications. Our thin film composite membranes meet or exceed industry standards, with
salt rejection rates ranging from 96 to 99.5 percent. Residential membranes are listed below.
WATER QUALITY & CONDITIONING PRODUCTS
FEED
BRINE SEAL
OUTER TAPPING
A
O-RING
CONCENTRAT E
PERMEATE
CONCENTRAT E
B
C
D
E
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Watts®commercial membranes
Part Number Application O.D. Length Capacity No. Per
(GPD) Case
W-2521-TW Tap water 2-1/2" 21" 300 1
W-2540-TW Tap water 2-1/2" 40" 800 1
W-4021-TW Tap water 4" 40" 1,050 1
W-4040-TW Tap water 4" 40" 2,200 1
W-4040-BW Brackish water 4" 40" 2,200 1
W-4040-SW Sea water 4” 40” 2,200 1
Note: Watts commercial membranes are packaged in preservatives. Keep in cool environment if stored for prolonged periods of time.
Watts membrane specifications
Data W-2521-TW W-2540-TW W-4021-TW W-4040-TW W-4040-BW
Membrane type TFC TFC TFC TFC TFC
Material Polyamide Polyamide Polyamide Polyamide Polyamide
Charge Negative Negative Negative Negative Negative
Configuration Spiral-wound Spiral-wound Sprial-wound Spiral-wound Sprial-wound
Salt rejection 99.5% 99.5% 99.5% 99.5% 99.5%
Max. operating temp. 113°F / 45°C 113°F / 45°C 113°F / 45°C 113°F / 45°C 113°F / 45°C
Max. operating pressure 400 psi 400 psi 400 psi 400 psi 600 psi
Maximum turbidity (NTU) <1 <1 <1 <1 <1
Max. SDI <5 <5 <5 <5 <5
pH range (cleaning) 2-11 2-11 2-11 2-11 2-11
Flux (GPD) 300 800 1,050 2,200 2,200
Note:Tap water membrane specifications are based on 225 psi pressure and 77°F temperature.
Watts®membranes
We offer a complete line of residential and commercial membranes for tap, brackish and sea
water applications. Our thin film composite membranes meet or exceed industry standards, with
salt rejection rates ranging from 96 to 99.5 percent. Commercial membranes are listed below.
Dimensions: A = 4.0”; B = 40”; C = 0.75”.
WATER QUALITY & CONDITIONING PRODUCTS
FEED
U-cup Brine Seal
Outer Tapping
C
A
End Cap
CONCENTRATE
PERMEAT E
CONCENTRATE
B