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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
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" Sealed Carbon 5 Micron Inline 4 Stage  Reverse Osmosis 50 gpd TFC - CW5000, RO440, NRO4-50
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 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
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" x 2 1/2" DC155635
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" Under Sink RO
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" Under Sink RO Faucet - Brush Nickel Long Reach 1/4"
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 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 1/4" Faucet Long Reach Air Gap S1089-02
Faucet Long Reach 1/4"
Your Price: $19.95
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".
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.
10" x 4 5/8" Sediment Poly-ester Filter rated 50 micron, the official Pentek R50-BB Filter MB-01-20 1 Micron GE Osmonics 1013239 Case of 20
Pentek R50-BB, 10" x 4 5/8" Sediment Poly-ester Filter rated 50 micron 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" Tube x 7/16"   RO Faucet Threaded Adapter Fitting 1/4" x 1/4"  Union Elbow JG-PI0308S S1406
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" 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
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
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
Fitting JG - Drain Restrictor Elbow 1/8 m x 1/4 tube Gauge Low Pressure 0 - 20 lbs. psi for tank checking
Drain Restrictor is built into this 1/8 male thread x 1/4 John Guest Elbow used commonly in connections to RO membrane housings and the drain line. 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" X 11.75"
Granular Activated Carbon Cartridge 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 - 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 Housing -  Slimline 3/8 inch threaded inlet and outlet openings
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 ). 20" x 2 1/2 " 5 Micron Pre-Filter Spun DC155016
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"  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, 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, 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" TW30-1812-50 , TFM-50
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 0-9990 PPM Microline TFC-335  Reverse Osmosis 50 GPD
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 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.

O-ring for Housing Slimline 1/4 inch DH4200W25 PN DMOR4 O-ring for Housing Slimline 3/8 inch DH150005 PN 151121
O-ring for Housing Slimline 1/4 inch DH4200W25 PN DMOR4 O-ring for Housing Slimline 3/8 inch DH150005 PN 151121
Oring 1/4" Tubing Retainer Quick Connect
Oring for 1/4" Tubing Retainer John Guest and Parker Quick Connect. Oring Sump Big Blue DM151122 OR-100
Pentek, "clear" version,"Big" housing, PN 151254,a  Buna-N square cut o-ring. Parker 1/4 F  x 1/4 JG Elbow Tank Shut Off
Buna-N square cut o-ring, part number 151254 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 ).
Permeate Pump - ERP1000 Piercing Valve 1/4" pn S111801
Permeate Pump - ERP1000
Your Price: $78.95
Permeate Pump - ERP1000 Piercing Valve 1/4" pn S111801.
Used to tap into cold water line under sink.
Push In repair collet and oring .25 pn 7209566 Push In repair collet and oring .38 pn 7209574
Push In repair collet and oring .25" ( 1/4" ) pn 7209566
Repair part for Sears RO ( reverse osmosis ) connections.
Push In repair collet and oring 3/8" ) pn 7209574
Repair part for Sears RO ( reverse osmosis ) connections.
Silicone 1 Gram Tube Lubricant for O-rings
Liquid Sanitizer Concentrate for sanitizing Water Softeners, RO Units, and Water Coolers.
Cleans and Restores Your System
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.
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
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.
Test Kit Water Works Strips - Hardness, Iron, pH, Nitrates, Alkalinity 481302 Tester, TDS  Good Bad for Well Water 80 PPM
This kit performs 6 different tests. Two test strips for each.
Iron content ( in ppm ), the pH level and the hardness ( in ppm and grains ), total alkalinity ( in ppm ), Nitrate and Nitritate ( as N ) in ppm.
Tester measures the Total Dissolved Solids ( TDS ) in your water.
If TDS is above 80 ppm, it will Test BAD, otherwise, the Green GOOD light will come on.
NOTE: Works on all City water or most well water whose starting TDS is less than 1000 ppm.
Wrench for Slimline 1/4 inch DH4200W25 - DMWR100
Wrench for Slimline 1/4 inch DH4200W25 - DMWR100