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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 Kit Pre and Post - North Star NSRO42C4 PN 7287506 Filter MB-01-20 1 Micron GE Osmonics 1013239 Case of 20
Filter - Carbon Cartridge PROSYSTEM 38675
Usually Ships in 2 to 3 Business Days
Your Price: $77.00
Filter Kit Pre and Post - North Star NSRO42C4 PN 7287506
Usually Ships in 24 Hours
Your Price: $48.00
Filter MB-01-20 1 Micron GE Osmonics 1013239 Case of 20
AVAILABLE FOR ORDER
Your Price: $134.00
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 ).
Filter Kit, 1 each of Pre and Post - North Star NSRO42C4 PN 7287506
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

Filter MB-25-9 7/8 GE Osmonics 1013232 Case of 40 Fitting 1/4" stem x 1/4" quick connect Elbow JGPI220808S Fitting 1/4" Tube x 7/16"   RO Faucet Threaded Adapter
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 ( 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 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 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" 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" Union JG-PI0412S
IN STOCK
Your Price: $3.49
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 20 inch Big Blue Filter Housing w/ Pressure Relief and 1" inlet and outlet.  Takes 4.5" diameter x 20" tall filters.
Housing - Big Blue 20 inch - 150233
IN STOCK
Your Price: $74.00
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 Pre-Filter 3/4 inch DH150067
Housing Clip ( one ) - RCL068
IN STOCK
Your Price: $1.00
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 - 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-PR067 Housing -  Slimline 1/4 inch threaded inlet and outlet openings Housing -  Slimline 3/8 inch threaded inlet and outlet openings
Housing Slimline 3/8 inch DH150005
IN STOCK
Your Price: $16.95
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" Membrane - 36 GPD TFC 11.75"  RMSTD36T Water Shield
Membrane - 25 GPD TFC 11.75" RMSTD24T
IN STOCK
Your Price: $44.95
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 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 - TW30-4021 Filmtec 4 x 21 inches Membrane 14 - 16 GPD CTA  11 3/4"
Membrane - North Star Model NSRO42C4 PN 7287514
Usually Ships in 1 to 2 Business Days
Your Price: $79.95
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.
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".
Membrane, 50GPD TFC 11.75" TW30-1812-50 , TFM-50 Microline TFC-335  Reverse Osmosis 50 GPD Oring 1/4" Tubing Retainer Quick Connect
Microline TFC-335 Reverse Osmosis 50 GPD
IN STOCK
Your Price: $299.00
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 for 1/4" Tubing Retainer John Guest and Parker 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 O-ring for Housing Slimline 1/4 inch DH4200W25 PN DMOR4
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 Parker 1/4 F  x 1/4 JG Elbow Tank Shut Off
Oring Sump Big Blue DM151122 OR-100
IN STOCK
Your Price: $5.99
O-ring for Housing Slimline 3/8 inch DH150005 PN 151121 Oring Sump Big Blue DM151122 OR-100 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 ).
Pentek GS-10RO-G 10" Inline GAC Filter - 1/4" JG Permeate Pump - ERP1000 Piercing Valve 1/4" pn S111801
Permeate Pump - ERP1000
IN STOCK
Your Price: $78.95
Piercing Valve 1/4" pn S111801
IN STOCK
Your Price: $6.95
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.
Used to tap into cold water line under sink.
Meter, TDS  range 0-9990 PPM Push In repair collet and oring .25 pn 7209566 Push In repair collet and oring .38 pn 7209574
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 o-ring 3/8" pn 7209574
Repair part for Sears RO ( reverse osmosis ) connections.

4 Stage  Reverse Osmosis 50 gpd TFC - CW5000, RO440, NRO4-50 Big Pump 3 Stage RO Watershield 36 gpd Classic 3 Stage RO Watershield 36 gpd
RO Big Pump 3 Stage Watershield 36 gpd
IN STOCK
Your Price: $324.00
RO Classic 3 Stage Watershield 36 gpd
IN STOCK
Your Price: $244.00
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.
Watershield Classic 3 Stage Reverse Osmosis Drinking Water System.
Pre-filter, 36 gpd Membrane, Post-filter, Holding Tank, Faucet, and Installtion Kit ( plus Manual ).
Shut off Inline 1/4'' FQC X 1/4'' FQC SV040808W Shut off Inline 3/8'' FQC X 3/8'' FQC SV041212W
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  John Guest connections for 3/8" O.D. tubing.
Silicone 1 Gram Tube Lubricant for O-rings Tank NSF 3.2 R.O. Storage Tank White pn C2000 RO-132 Tank Shut Off 1/4 F x 3/8 JG Elbow PN S1037

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
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 Housings PN 150296 or SW-3r SW-3 Wrench for Slimline 1/4 inch DH4200W25 - DMWR100 Wrench Pentek 150295, Nelsen SW-2
Wrench for Big Blue 10" or 20" Housings PN 150296 or SW-3 Wrench for Slimline 1/4 inch DH4200W25 - DMWR100 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