Log In Log In  |  Checkout   |  178 item(s)
3 x 2nd stage C10 carbon block filter (replace every 6-12 months)
2 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x 326, 3rd stage TFC 24 /26 US membrane filter (replace 2-3 yrs)
4 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
1 x 2.CB2010, 2nd stage carbon block filter 20" inch for RD322 RO260
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
2 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
2 x UC SHELL, Honeywell UC7000 Empty System Only No Filter
2 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
2 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
3 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
2 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x PSW-280 Aquatec Pressure Switch 80 psi shut off 1/4 tubing TSO
5 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
2 x NM-5103, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x NM-5104, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
3 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
2 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 4th stage TFC 75/85 US membrane filter (every 2-3 yrs) M75
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x NM-5102, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
2 x 205, 3rd stage solid carbon block filter (replace every 12month)
3 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x FV-15, Bobby Float Valve Top Mount RM292P-N UNS CEL NSF USA
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x DB40, DI Resin Refill Bag for DI210, RD322
2 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
2 x Special, Single Stage Housing Bracket Shell Connection Kit
2 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x 719, Drain Saddle Clamp / Valve
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
1 x .SW-1C COUNTERTOP WATER FILTER SYSTEM (CLEAR HOUSING)
1 x EMT-10, Empty Filter Cartridge Casing Housing
3 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 720, Feed Water Adapter with Needle Valve
1 x 318, 4th stage TFC-18 US membrane filter (replace every 2-3 yrs)
2 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x UC7000 HONEYWELL UNDER THE COUNTER WATER FILTER (WHITE, LARGE)
1 x 706, Membrane Filter Casing Housing Assembly
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
2 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
5 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
2 x 3.CB2010, 3rd stage carbon block filter 20" inch for RD322 RO260
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
1 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x 324, 4th stage TFC-24 US membrane filter (replace every 2-3 yrs)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
1 x SV-24DC-14, Solenoid Valve ESO 1/4" plastic, 24V DC
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
4 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x 205, 5th stage final carbon filter
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
2 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x 578b, TDS-3 Battery Batteries for #578 TDS Water Quality Meter
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x IM60, Ice Maker or RV Water Filter, Inline Typle
1 x 225, 5th stage Inline Alkaline filter with clear case (annual)
2 x KF310UP, SUBSTITUTE/Upgrade to KYTON FAUCET POLISHED CHROME FINI
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
2 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x 752, DC Booster Pump w/ Transformer
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x AQF-600-102, Flow Meter Panel Mount 3/8" MPT
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x 3/4" NPT Digiflow Digital Flow Meter count up total Water Gallon
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x UU Clips Pair Membrane to Membrane, 2.5" to 2.5"
1 x KF612, Elite Series: Oil Rubbed Bronze ORB Drinking Water Faucet
1 x *Discontinued* RD106
1 x 5th Stage pn215 Refillable inline DI filter (color change)
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x KF320, Elite Series: Brushed Nickel / Stainless Steel Faucet
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x Panel 1/2" 6710M-44TM Digital Flow Meter count up Gallon 115V
1 x bulksf05, Koolermax Sediment Filter
1 x BBK10, Replacement Filter Big Blue Whole House WH-1134
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x Panel 1" Digiflow 6710M-88TM Digital Flow Meter count up GPM 115
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD150
1 x 578, TDS Water Quality Meter tds-3
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR122
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x WH-250, Whole House Water Treatment Sediment Carbon Filter Syste
1 x KF355, Antique Brushed Brass / Iron Finish Drinking Water Faucet
1 x HK120-P-TK-220V for EURO 220V / 50Hz
1 x DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x 365, 4th stage TFC 50/65 US membrane filter (replace 2-3 yrs)
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO

View Cart$7,288.01
Specials Log InCreate Account Checkout  Shopping Cart178 item(s)
3 x 2nd stage C10 carbon block filter (replace every 6-12 months)
2 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x 326, 3rd stage TFC 24 /26 US membrane filter (replace 2-3 yrs)
4 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
1 x 2.CB2010, 2nd stage carbon block filter 20" inch for RD322 RO260
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
2 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
2 x UC SHELL, Honeywell UC7000 Empty System Only No Filter
2 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
2 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
3 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
2 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x PSW-280 Aquatec Pressure Switch 80 psi shut off 1/4 tubing TSO
5 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
2 x NM-5103, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x NM-5104, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
3 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
2 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 4th stage TFC 75/85 US membrane filter (every 2-3 yrs) M75
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x NM-5102, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
2 x 205, 3rd stage solid carbon block filter (replace every 12month)
3 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x FV-15, Bobby Float Valve Top Mount RM292P-N UNS CEL NSF USA
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x DB40, DI Resin Refill Bag for DI210, RD322
2 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
2 x Special, Single Stage Housing Bracket Shell Connection Kit
2 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x 719, Drain Saddle Clamp / Valve
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
1 x .SW-1C COUNTERTOP WATER FILTER SYSTEM (CLEAR HOUSING)
1 x EMT-10, Empty Filter Cartridge Casing Housing
3 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 720, Feed Water Adapter with Needle Valve
1 x 318, 4th stage TFC-18 US membrane filter (replace every 2-3 yrs)
2 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x UC7000 HONEYWELL UNDER THE COUNTER WATER FILTER (WHITE, LARGE)
1 x 706, Membrane Filter Casing Housing Assembly
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
2 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
5 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
2 x 3.CB2010, 3rd stage carbon block filter 20" inch for RD322 RO260
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
1 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x 324, 4th stage TFC-24 US membrane filter (replace every 2-3 yrs)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
1 x SV-24DC-14, Solenoid Valve ESO 1/4" plastic, 24V DC
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
4 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x 205, 5th stage final carbon filter
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
2 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x 578b, TDS-3 Battery Batteries for #578 TDS Water Quality Meter
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x IM60, Ice Maker or RV Water Filter, Inline Typle
1 x 225, 5th stage Inline Alkaline filter with clear case (annual)
2 x KF310UP, SUBSTITUTE/Upgrade to KYTON FAUCET POLISHED CHROME FINI
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
2 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x 752, DC Booster Pump w/ Transformer
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x AQF-600-102, Flow Meter Panel Mount 3/8" MPT
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x 3/4" NPT Digiflow Digital Flow Meter count up total Water Gallon
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x UU Clips Pair Membrane to Membrane, 2.5" to 2.5"
1 x KF612, Elite Series: Oil Rubbed Bronze ORB Drinking Water Faucet
1 x *Discontinued* RD106
1 x 5th Stage pn215 Refillable inline DI filter (color change)
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x KF320, Elite Series: Brushed Nickel / Stainless Steel Faucet
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x Panel 1/2" 6710M-44TM Digital Flow Meter count up Gallon 115V
1 x bulksf05, Koolermax Sediment Filter
1 x BBK10, Replacement Filter Big Blue Whole House WH-1134
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x Panel 1" Digiflow 6710M-88TM Digital Flow Meter count up GPM 115
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD150
1 x 578, TDS Water Quality Meter tds-3
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR122
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x WH-250, Whole House Water Treatment Sediment Carbon Filter Syste
1 x KF355, Antique Brushed Brass / Iron Finish Drinking Water Faucet
1 x HK120-P-TK-220V for EURO 220V / 50Hz
1 x DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x 365, 4th stage TFC 50/65 US membrane filter (replace 2-3 yrs)
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO

View Cart$7,288.01

3rd stage Special High Efficiency Membrane Filter HTFC-150 [HTFC3150]

$55.00

3rd stage Special High Efficiency Membrane Filter HTFC-150

* p/n HTFC-150, (1:1 ratio) Special High Efficiency TFC type RO membrane filter

* Capacity:  100 GPD gallons per day at 60 psi input pressure.  120GPD at 80 psi, 150 GPD at 100 psi.

* This is a high efficiency 1 to 1 ratio RO membrane.  The production rate is about 260 to 300 mL per minute and the drain rate using 300 mL/min flow restrictor is about 280 to 320 mL/min depending on input pressure.  Therefore the product to drain ratio is approximately 1 to 1 (versus a conventional, typical RO membrane the product to drain ratio is 1:3 to 1:4)

* The rejection rate is pressure dependent as well.  Average NaCl rejection is about 90% to 93%

* This membrane filter is standard size.  It fits all standard size membrane housing 

* The drain flow control or the flow restrictor should be 300 mL/min  

 

Brand Name: USM RO Membrane 

Assembled and made in California, USA 

Standard size Reverse Osmosis membrane filter.  Fits all standard size RO systems and membrane housing. 

Model#  HTFC-150    100 GPD gallons per day capacity 

  

Specifications: 

This membrane fits all standard size membrane housing, standard RO systems.  

You can increase the capacity of your existing RO system by getting a higher capacity membrane filter with a matching flow restrictor, or getting a membrane module which comes with membrane filter, housing, fitting, flow restrictor, and check valve. 

  

Membrane Material:  HTFC Thin Film Composite 

Production rate: 100 gallons per day   Actual production rate varies depending on input pressure and temperature. 

Max. Operating Pressure:  130 psi 

Max. Operating Temperature:  120 F  ( 49 C) 

Recommended concentrate flow rate: 1x permeate 

(drain to pure water ratio  1:1) 

pH range: 3- 11 

Chlorine Tolerance: 0 ppm 

Dimension:  standard size 2” diameter x 11.75” length 

  

Performance: 

Applied water supply pressure: 65 psi at 77F 

Nominal Salt rejection rate: 90% to 93% 

Nominal TDS rejection rate: about 90% to 93% at 300 ppm input 

  

Features: 

Consistent quality and reliability using automated production line. 

Dry type membrane for extended shelf life 

Fits all standard membrane housings 

  

How to choose the correct RO membrane filter for your RO system? 

  1. Need to have a standard size RO system with standard membrane housing (look at photo) 
  2. Check the capacity of your RO system or RO membrane.  Capacity means how fast the membrane produces water.  The number means gallons per day (GPD).  Look for the keywords in the RO system owner’s manual or specifications. 
  3. Find the GPD rating from the membrane filter label when you take out the membrane filter. 
  4. Find the GPD rating from the drain flow rate or from the flow restrictor that is connected to the drain line. 

Flow restrictor size (drain rate) 300 mL/min.  

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