Official PayPal Seal


You are here: Home > R.O. Filters
Choose a sub category:
RO 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
10 inch Sediment Pre Filter Spun Poly P5 DC155014
Your Price: $4.95
10" Carbon Block Matrikx CTO 2 - 5 Micron DCS1258
Your Price: $11.95
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.
10 4 Stage  Reverse Osmosis 50 gpd TFC - CW5000, RO440, NRO4-50
10" Sealed Carbon 5 Micron Inline
Your Price: $10.00
4 Stage Reverse Osmosis 50 gpd TFC - CW5000, RO440, NRO4-50
Your Price: $195.00
10" Sealed Carbon 5 Micron Inline
1/4" female thread openings
4 Stage TFC Reverse Osmosis Unit, 50 gallon per day production rate.
Pre-filter, Carbon Block filter, Membrane, and Activated Carbon Inline post-filter.
Automatic Shut-Off  ( ASO ) Valve w/JACO fittings Automatic Shut-Off  ( ASO ) Valve w/JG fittings
Automatic Shut-Off ( ASO ) Valve 4 way w/ 1/4 JACO Fittings
Your Price: $12.00
Automatic Shut-Off ( ASO ) Valve 4 way w/ 1/4 JG Fittings
Your Price: $15.00
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 20 inch Carbon Block Filter Replacement
Your Price: $69.00
Big Blue 20 inch Sediment Filter Replacement
Your Price: $21.50
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.
Big Pump 3 Stage RO Watershield 36 gpd Carbon Block  20
Big Pump 3 Stage RO Watershield 36 gpd
Your Price: $289.00
Carbon Block 20" x 2 1/2" DC155635 EPM 20
Your Price: $19.95
Watershield Super Big Pump 3 Stage Reverse Osmosis Drinking Water System.
Features Permeate booster pump for faster production of drinking water.
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
Classic 3 Stage RO Watershield 36 gpd Drain Clamp 1/4
Classic 3 Stage RO Watershield 36 gpd
Your Price: $244.00
Drain Clamp 1/4" Under Sink RO
Your Price: $4.95
Watershield Classic 3 Stage Reverse Osmosis Drinking Water System.
Pre-filter, 36 gpd Membrane, Post-filter, Holding Tank, Faucet, and Installtion Kit ( plus Manual ).
Drain Clamp with 1/4" connection.
For drain lines that come directly from the RO unit and no Air Gap Faucet used.
Drain Clamp 3/8 Faucet Long Reach 1/4
Drain Clamp 3/8" Under Sink RO
Your Price: $4.95
Faucet Long Reach 1/4"
Your Price: $19.95
Drain Clamp with 3/8" connection. PN S1117-01
For drain lines that come down from the Air Gap Faucet.
Long Reach replacement faucet with 1/4" fitting.
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".
Faucet Long Reach Air Gap S1089-02 10
Faucet Long Reach Air Gap S1089-02
Your Price: $39.00
Filter - Pentek R50-BB, W50PEHD, R50-BBSa
Your Price: $16.95
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.
Pentek R50-BB, 10" x 4 5/8" Sediment Poly-ester Filter rated 50 micron
Filter MB-01-20 1 Micron GE Osmonics 1013239 Case of 20 Fitting 1/4
Filter MB-01-20 1 Micron GE Osmonics 1013239 Case of 20
Your Price: $119.00
Fitting 1/4" x 1/4" Union Elbow JG-PI0308S S1406
Your Price: $2.95
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
SPECIAL ORDER Item, please allow 2 weeks lead time for shipping.
Fitting 1/4" x 1/4"  Union Elbow JG-PI0308S S1406
Fitting 1/4 3/8
Fitting 1/4" x 1/4" x 1/4" Union Tee JG-PI0208S
Your Price: $4.95
Fitting 3/8" Tube x 7/16" RO Faucet Threaded Adapter
Your Price: $6.00
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 ).
3/8 Gauge Low Pressure 0 - 20 lbs. psi for tank checking
Fitting 3/8" x 3/8" x 1/4" Reducing Tee JG-PI301208S
Your Price: $6.95
Gauge Low Pressure 0 - 20 lbs. psi for tank checking
Your Price: $9.95
3/8" x 3/8" x 1/4" Reducing Tee JG-PI301208S Low Pressure Gauge in one pound increments to check your R.O. Storage Tank ( proper pressure is 7 - 8 lbs. ).
Granular Activated Carbon Cartridge Housing for standard Membrane, PN RP2500. <br>Should fit all reverse osmosis membrane - standard size 1.75
Granular Activated Carbon Cartridge
Your Price: $10.00
Housing for Membrane - 11.75" our PN RP2500
Your Price: $11.95
Granular Activated Carbon Cartridge Housing for standard Membrane, PN RP2500.
Should fit all reverse osmosis membrane - standard size 1.75" X 11.75"
TFC 50 gpd Membrane, Prefilter, Post, Inline for 4 stage RO Systems ( like the Flowmatic ). 20
KIT ( set of 4 ) TFC 50 gpd Membrane, Prefilter, Post, 10" Inline
Your Price: $65.00
Longer 20" x 2 1/2 " 5 Micron Pre-Filter Spun DC155016
Your Price: $12.50
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
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.
Membrane - TW30-1812-24  Filmtec 24 GPD TFC 11.75 Membrane - 36 GPD TFC 11.75
Membrane - 25 GPD TFC 11.75" RMSTD24T
Your Price: $44.95
Membrane - 36 GPD TFC 11.75" RMSTD36T Water Shield
Your Price: $44.95
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 - TW30-4021 Filmtec 4 x 21 inches Membrane 14 - 16 GPD CTA  11 3/4
Membrane - TW30-4021 Filmtec 4 x 21 inches
Your Price: $393.00
Membrane 14 - 16 GPD CTA 11 3/4"
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 Clack 50 GPD TFC Revised Seal S1764RS Membrane, 50GPD TFC 11.75
Membrane Clack 50 GPD TFC Revised Seal S1764RS
Your Price: $49.95
Membrane, 50GPD TFC 11.75" TW30-1812-50 , TFM-50, TLC-50
Your Price: $39.00
Newer 50 GPD TFC Revised Seal Membrane used in Clack TFC-300, and TFC-400
S1764RS is used in the newer "50 gpd" models that look like Microline, but do not use this name, but instead has model number like the T.F.C. - 300 and - 400.
50 GPD (gallons per day) TFC style reverse osmosis membrane RO - Fits Standard Size Membrane Housing.
Tip to tip length 11.75 inches.
Meter, TDS  range 0-999 PPM Hanna Digital Meter, TDS  range 0-9990 PPM
Meter, TDS range 0-999 PPM Pocket Digital
Your Price: $24.95
Meter, TDS range 0-9990 PPM
Your Price: $29.95
Meter measures the Total Dissolved Solids ( TDS ) in your water.
Use to determine if your Membrane is still working properly.
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.
Microline TFC-335  Reverse Osmosis 50 GPD Oring 1/4
Microline TFC-335 Reverse Osmosis 50 GPD
Your Price: $289.00
Oring 1/4" Tubing Retainer Quick Connect
Your Price: $1.00
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.
Parker 1/4 F  x 1/4 JG Elbow Tank Shut Off
Oring Sump Big Blue DM151122 OR-100
Suggested Price: $5.49
Parker 1/4 F x 1/4 JG Elbow Tank Shut Off
Your Price: $8.00
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 ).
Piercing Valve 1/4 Push In repair collet and oring .25 pn 7209566
Piercing Valve 1/4" pn S111801
Your Price: $6.95
Push In repair collet and oring .25 pn 7209566
Your Price: $7.99
Piercing Valve 1/4" pn S111801.
Used to tap into cold water line under sink.
Push In repair collet and oring .25" ( 1/4" ) pn 7209566
Repair part for Sears RO ( reverse osmosis ) connections.