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You are here: Home > R.O. Filters
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Membrane Operation
Below you will find common "generic" filters and membranes used in most Reverse Osmosis drinking water systems.
NOTE: Microline R.O. filters and parts are listed in their own separate category ( to the left )

LINK TO: Low water flow RO filters - Tank Pressure Problem

LINK TO: How often do we need to change the RO filters?

Sediment Pre Filter Spun Poly P5 10 inch DC155014 Matrikx CTO 2  - 5 Micron 10" Carbon Block DCS1258 Granular Activated Carbon Cartridge
10" Granular Activated Carbon Cartridge
IN STOCK
Your Price: $10.00
Sediment Pre Filter Spun Poly P5 10 inch
Best sediment only pre-filter for all standard reverse osmosis drinking water systems.
Matrikx CTO 2 is a 5 Micron 10" Carbon Block
The most commonly used replacement filter
Can be used as Prefilter and Post filter in most RO systems.
Granular Activated Carbon Cartridge
10" Sealed Carbon 5 Micron Inline 20" x 2 1/2 " 5 Micron Pre-Filter Spun DC155016 Carbon Block  20" x 2 1/2" DC155635
10" Sealed Carbon 5 Micron Inline
1/4" female thread openings
20" in length and approximately 2 1/2" in diameter with a 5 Micron rating.
Pre-Filter Spun - Poly used in large commercial reverse osmosis systems and some home whole house filter housings.
EPM 20, Carbon Block Filter 20" in length and approximately 2 1/2" in diameter with a 5 Micron rating.
Used as either / both Pre-Filter or / and Post Filter
Filter, 9.75 x 2.75, 30 Micron Pleated, 155017 Automatic Shut-Off  ( ASO ) Valve w/JACO fittings Automatic Shut-Off  ( ASO ) Valve w/JG fittings
9.75 x 2.75, 30 Micron Pleated Filter
IN STOCK
Our Price: $10.95
Filter, 9.75 x 2.75, 30 Micron Pleated, 155017 Automatic Shut-Off  ( ASO ) Valve w/JACO fittings Automatic Shut-Off  ( ASO ) Valve w/JG fittings
Big Blue 20 inch Carbon Block Filter Replacement Big Blue 20 inch Sediment Filter Replacement Big Blue Filter - Pentek R30-BB, W30PEHD, 155101-43
20" x 4 5/8" Carbon Block Filter rated 5 micron.
Replacement cartridge used in Big Blue Housing.
20" x 4.5" Sediment Filter rated 5 micron.
Replacement cartridge used in Big Blue Housing.
10" x 4 5/8" Sediment Poly-ester Filter rated 30 micron, Big Blue Filter - Pentek R30-BB, W30PEHD, 155101-43
10" x 4 5/8" Sediment Poly-ester Filter rated 50 micron, the official Pentek R50-BB Drain Clamp 1/4" Under Sink RO Drain Clamp 3/8" Under Sink RO
Drain Clamp 1/4" Under Sink RO
IN STOCK
Your Price: $4.95
Drain Clamp 3/8" Under Sink RO
IN STOCK
Your Price: $4.95
Pentek R50-BB, 10" x 4 5/8" Sediment Poly-ester Filter rated 50 micron Drain Clamp with 1/4" connection.
For drain lines that come directly from the RO unit and no Air Gap Faucet used.
Drain Clamp with 3/8" connection. PN S1117-01
For drain lines that come down from the Air Gap Faucet.
Faucet - Brush Nickel Long Reach 1/4" Faucet Long Reach 1/4" Faucet Long Reach Air Gap S1089-02
Faucet - Brush Nickel Euro Long Reach
IN STOCK
Your Price: $49.95
Faucet Long Reach 1/4" reference RF103
IN STOCK
Your Price: $24.95
European style Brushed Nickel Stainless Steel, Long Reach replacement faucet with 7/16" threaded RO connection - a 1/4" brass nut fitting is included.
You can purchase new 1/4" x 7/16" fitting or 3/8" x 7/16" fitting to match your tubing size, or you can re-use your old connector.

Long Reach replacement faucet with 1/4" fitting ( RF103 )
If you have 3/8" tubing, you can reuse your old connector.
If your faucet has 3 lines of tubing connected to it, then it is the "Air Gap" version.
This item ( 930314W ) is considered "non air gap".
Long Reach Faucet with Air Gap and 1/4" O.D. water line fitting.
Has connections for three lines used with "air gap" type Reverse Osmosis installations.
Filter - Carbon Cartridge PROSYSTEM 38675 Filter 20 inch 1 Micron Spun Polypropylene Case of 25 NP1-20 Filter Kit Pre and Post - North Star NSRO42C4 PN 7287506
Filter - Carbon Cartridge PROSYSTEM 38675
Usually Ships in 2 to 3 Business Days
Your Price: $78.00
Filter 20 inch 1 Micron Spun Polypropylene Case of 25 NP1-20
Usually Ships in 1 to 2 Business Days
Your Price: $134.00
Filter Kit Pre and Post - North Star NSRO42C4 PN 7287506
Usually Ships in 24 Hours
Your Price: $48.00
Replacement Carbon Filter cartridge ( 38675 or 17561 which is 4.5" diameter ) that fits the PROSYSTEM Model 38247 Filter System.
4.5" X 7.0" CARBON BLOCK FILTER CARTRIDGE* This is a special order item, that is Drop Shipped directly from Aquion ( in Illinois ).
melt blown, 20", 1 micron (nominal) filtration rating, stock them in AZ and OH only Case of 25 - PN = NP1-20
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2-1/2 x 20" long Standard 1 micron spun polypropylene sediment filter cartridge for residential water filters for removal of dirt, rust & sediment

Filter Kit, 1 each of Pre and Post - North Star NSRO42C4 PN 7287506
Filter MB-01-20 1 Micron GE Osmonics 1013239 Case of 20 Filter MB-25-9 7/8 GE Osmonics 1013232 Case of 40 Fitting 1/4" stem x 1/4" quick connect Elbow JGPI220808S
Filter MB-25-9 7/8 GE Osmonics 1013232 Case of 40
Usually Ships in 1 to 2 Weeks
Your Price: $144.00
Fitting 1/4" stem x 1/4" quick connect Elbow JGPI220808S
Usually Ships in 1 to 2 Business Days
Your Price: $2.49
Sold as one Case of ( 20 ) Filters MB-01-20 1 Micron GE Osmonics 1013239
2-1/2 x 20" long Standard 1 micron spun polypropylene sediment filter cartridge for residential water filters for removal of dirt, rust & sediment

Sold as one Case of ( 40 ) Filters MB-25-9 7/8 GE Osmonics 1013232 ( Autotrol Brand Filters )
2-1/2 x 9 7/8" long Standard 25 micron spun polypropylene sediment filter cartridge for residential water filters for removal of dirt, rust & sediment
SPECIAL ORDER Item, please allow 2 weeks lead time for shipping.
Fitting 1/4" stem x 1/4" quick connect Elbow JGPI220808S
Fitting 1/4" Tube x 7/16"   RO Faucet Threaded Adapter Fitting 1/4" x 1/4"  Union Elbow JG-PI0308S S1406 Fitting 1/4" x 1/4" x 1/4" Union Tee JG-PI0208S
1/4" Tube x 7/16" uns Female Threaded Adapter used with RO faucet ( 59JGCI3208U7S ). Fitting 1/4" x 1/4"  Union Elbow JG-PI0308S S1406 Fitting 1/4" x 1/4" x 1/4" Union Tee JG-PI0208S
3/8" Tube x 7/16"   RO Faucet Threaded Adapter Fitting 3/8" x 1/4" Reducing Union JG-PI201208S Fitting 3/8" x 3/8" Union JG-PI0412S
Fitting 3/8" x 3/8" Union JG-PI0412S
IN STOCK
Your Price: $3.49
3/8" Tube x 7/16" uns Female Threaded Adapter used with RO faucet ( 59JGCI3212U7S ). Fitting 3/8" x 1/4" Reducing Union JG-PI201208S Fitting 3/8" x 3/8" Union JG-PI0412S
3/8" x 3/8" x 1/4" Reducing Tee JG-PI301208S Fitting 3/8" x 3/8" x 3/8" Union Tee JG-PI0212S Gauge Low Pressure 0 - 20 lbs. psi for tank checking
3/8" x 3/8" x 1/4" Reducing Tee JG-PI301208S Fitting 3/8" x 3/8" x 3/8" Union Tee JG-PI0212S Low Pressure Gauge in one pound increments to check your R.O. Storage Tank ( proper pressure is 7 - 8 lbs. ).
20 inch Big Blue Filter Housing w/ Pressure Relief and 1" inlet and outlet.  Takes 4.5" diameter x 20" tall filters. Housing Clip ( one ) - RCL068 for standard Membrane, PN RP2500. Housing for standard Membrane, PN RP2500. <br>Should fit all reverse osmosis membrane - standard size 1.75" X 11.75"
Housing - Big Blue 20 inch - 150233
IN STOCK
Your Price: $74.00
Housing Clip ( one ) - RCL068
IN STOCK
Your Price: $1.00

20 inch Big Blue Filter Housing w/ Pressure Relief and 1" inlet and outlet. Takes 4.5" diameter x 20" tall filters.

Clip, individual, ( you might need TWO ) to attach the standard Membrane Housing ( PN RP2500 ) to the metal unit plate.
Housing for standard Membrane, PN RP2500.
Should fit all reverse osmosis membrane - standard size 1.75" X 11.75"
Housing Pre-Filter 3/4 inch DH150067 Housing Pre-Filter 3/4" x 20" DH150069 20-07B-PR067 Housing -  Slimline 1/4 inch threaded inlet and outlet openings
Housing - with 3/4" inch FPT threaded inlet and outlet openings ( common for most as pre-filter housing before water softener ).
Holds "standard" 10 inch x 2 1/2" filters.
Housing Pre-Filter 3/4" x 20" DH150069 20-07B-PR has 3/4 inch FPT threaded inlet and outlet openings
Holds "special" LONG 20 inch x 2 1/2" filters.
Housing, Slimline 1/4 inch, threaded inlet and outlet openings, DH4200W25
Housing -  Slimline 3/8 inch threaded inlet and outlet openings TFC 50 gpd Membrane, Prefilter, Post, Inline for 4 stage RO Systems ( like the Flowmatic ). Membrane - TW30-1812-24  Filmtec 24 GPD TFC 11.75"  RMSTD24T,Membrane, 25 GPD TFC  reverse osmosis membrane - standard size 1.75" X 11.75"
Housing Slimline 3/8 inch DH150005
IN STOCK
Your Price: $16.95
Membrane - 25 GPD TFC 11.75" RMSTD24T
IN STOCK
Your Price: $44.95
Housing -  Slimline 3/8 inch threaded inlet and outlet openings SET of 4 items > TFC 50 gpd Membrane, Prefilter, Post, Inline GAC Cartridge

Includes, as shown in photo:
( 1 ) 23S121005 - 5 micron sediment prefilter
( 1 ) 633225E12 - 5 micron carbon block filter
( 1 ) 24TFC50 - Membrane, 50 GPD TFC
( 1 ) 54GS10RO - 10" Inline GAC post filter 1/4" female threaded
Membrane, Dow Filmtec TW30-1812-24 24 GPD TFC RO reverse osmosis membrane - standard size 1.75" X 11.75"
Standard size membrane can be used as a replacement for most TFC model Reverse Osmosis.
Membrane - 36 GPD TFC 11.75"  RMSTD36T Water Shield Membrane - North Star Model NSRO42C4 PN 7287514 Membrane - TW30-4021 Filmtec 4 x 21 inches
Membrane - North Star Model NSRO42C4 PN 7287514
Usually Ships in 1 to 2 Business Days
Your Price: $79.95
Membrane, 36 GPD TFC RO reverse osmosis membrane - standard size 1.75" X 11.75"
Standard size membrane can be used as a replacement for most TFC model Reverse Osmosis.
Membrane - North Star Model NSRO42C4 PN 7287514

Membrane, Dow Filmtec TW30-4021 TFC RO reverse osmosis membrane - size 4" X 21"
Equilvalent Membrane will be shipped, not Filmtec.
Membrane 14 - 16 GPD CTA  11 3/4" Membrane, 50GPD TFC 11.75" TW30-1812-50 , TFM-50 Microline TFC-335  Reverse Osmosis 50 GPD
Microline TFC-335 Reverse Osmosis 50 GPD
IN STOCK
Your Price: $299.00
14 - 16 Gallons Per Day CTA Membrane measures 11 3/4" and is commonly used in standard CTA Reverse Osmosis system installed on chlorinated "city" water.
Sold in hundreds of different "Brands".
50 GPD (gallons per day) TFC style reverse osmosis membrane RO - Fits Standard Size Membrane Housing.
Tip to tip length 11.75 inches.
Microline Reverse Osmosis ( STF35ANGNM or TFC-335 ), is now 35 gallon per day with a 50 gpd T.F. C. membrane ( S1229RS ), Carbon Block Prefilter ( S7028 ), GAC Post Filter ( S7025 ) with storage tank and all accessories to install.

Oring 1/4" Tubing Retainer Quick Connect O-ring Set of Two NF-RO-ORING used with System NRO4-50 O-ring for  Housing Pre-Filter 3/4 inch DH150067 10-07B-PR in 10" or 20" length.  PN 151120
Oring for 1/4" Tubing Retainer John Guest and Parker Quick Connect. O-ring Set of Two for housings used with System NRO4-50. as EACH housing uses a DOUBLE o-ring pair.
So, you'll want to order TWO SETS ( for a total of 4 o-rings ).
O-ring for Housing Pre-Filter 3/4 inch DH150067 10-07B-PR in 10" or 20" length. PN 151120
O-ring for Housing Slimline 1/4 inch DH4200W25 PN DMOR4 O-ring for Housing Slimline 3/8 inch DH150005 PN 151121 Oring Sump Big Blue DM151122 OR-100
Oring Sump Big Blue DM151122 OR-100
IN STOCK
Your Price: $5.99
O-ring for Housing Slimline 1/4 inch DH4200W25 PN DMOR4 O-ring for Housing Slimline 3/8 inch DH150005 PN 151121 Oring Sump Big Blue DM151122 OR-100
Parker 1/4 F  x 1/4 JG Elbow Tank Shut Off Pentek GS-10RO-G 10" Inline GAC Filter - 1/4" JG Permeate Pump - ERP1000
Permeate Pump - ERP1000
IN STOCK
Your Price: $78.95
1/4" fpt x 1/4" John Guest RO Tank Shut Off Elbow, made by Parker for Microline.
Can be used on all under the sink RO holding tanks ( since they all have 1/4" mpt connections ).
10" Sealed Carbon 5 Micron Inline ( IL-10W-C-EZ ) with 1/4" tube connections.
Coconut Shell Carbon for better taste
* Special version ( not threaded ), instead has 1/4" John Guest QUICK Connect openings
Use with 1/4" O.D. tubing and Quick connect Fittings common on newer RO units.
Permeate Pump - ERP1000
Piercing Valve 1/4" pn S111801 Meter, TDS  range 0-9990 PPM Push In repair collet and oring .25 pn 7209566
Piercing Valve 1/4" pn S111801
IN STOCK
Your Price: $6.95
Piercing Valve 1/4" pn S111801.
Used to tap into cold water line under sink.
Meter measures the Total Dissolved Solids ( TDS ) in your water.
Use to determine if your Membrane is still working properly.
Offers Standard ( 0 - 999 ppm ) and High ( 1000 - 9990 ppm ) range for testing brackish water sources.

Push In repair collet and o-ring .25" ( 1/4" ) pn 7209566
Repair part for Sears RO ( reverse osmosis ) connections.

Push In repair collet and oring .38 pn 7209574 4 Stage  Reverse Osmosis 50 gpd TFC - CW5000, RO440, NRO4-50 Big Pump 3 Stage RO Watershield 36 gpd
RO Big Pump 3 Stage Watershield 36 gpd
IN STOCK
Your Price: $324.00

Push In repair collet and o-ring 3/8" pn 7209574
Repair part for Sears RO ( reverse osmosis ) connections.

4 Stage TFC Reverse Osmosis Unit, 50 gallon per day production rate.
Pre-filter, Carbon Block filter, Membrane, and Activated Carbon Inline post-filter.
Watershield Super Big Pump 3 Stage Reverse Osmosis Drinking Water System.
Features Permeate booster pump for faster production of drinking water.
Classic 3 Stage RO Watershield 36 gpd Sani-System Liquid Sanitizer Concentrate Water Softeners or RO Units Shut off Inline 1/4'' FQC X 1/4'' FQC SV040808W
RO Classic 3 Stage Watershield 36 gpd
IN STOCK
Your Price: $244.00
Watershield Classic 3 Stage Reverse Osmosis Drinking Water System.
Pre-filter, 36 gpd Membrane, Post-filter, Holding Tank, Faucet, and Installtion Kit ( plus Manual ).
Liquid Sanitizer Concentrate for sanitizing Water Softeners, RO Units, and Water Coolers.
Cleans and Restores Your System
Shut off Inline 1/4'' FQC X 1/4'' FQC SV040808W  John Guest connections for 1/4" O.D. tubing.
Shut off Inline 3/8'' FQC X 3/8'' FQC SV041212W Silicone 1 Gram Tube Lubricant for O-rings Tank NSF 3.2 R.O. Storage Tank White pn C2000 RO-132
Shut off Inline 3/8'' FQC X 3/8'' FQC SV041212W  John Guest connections for 3/8" O.D. tubing.

One gram of food grade silicone for use with o-rings, gaskets and seals.
Enough to lubricate about a dozen or more o-rings and seals.
These tubes come from one of the leading valve manufacturers.

3.2 gallon R.O. Storage Tank, White, pre-charged to 8 psi, is a compatible replacement for any brand of reverse osmosis.
Has standard 1/4" mpt fitting used with all undersink RO Storage Tank systems.
PN C2000 or RO-132
Tank Shut Off 1/4 F x 3/8 JG Elbow PN S1037 Wrench for Big Blue Housings PN 150296 or SW-3r SW-3 Wrench for Slimline 1/4 inch DH4200W25 - DMWR100
1/4" fpt x 3/8" John Guest - RO Tank Shut Off Elbow, made by Parker for Microline ( pn S1037 ).
Also, can be used on an R.O. Holding Tank that requires a 3/8" feed line connection.
Wrench for Big Blue 10" or 20" Housings PN 150296 or SW-3 Wrench for Slimline 1/4 inch DH4200W25 - DMWR100
Wrench Pentek 150295, Nelsen SW-2
Wrench for Housing Pre-Filter 3/4 inch DH150067 10-07B-PR.
Part number = 150295 or SW-2
Same wrench for the 10" and 20 " housing