Countertop RO
Faster Tankless Production
A practical choice for compatible countertop systems when faster fill time is desired compared with lower-GPD membranes.
100 GPD RO Reverse Osmosis Membrane — 1812 TFC/TW Type for Countertop & Under-Sink Systems — SKU TW-1812-100
$22.00
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Description
100 GPD residential RO membrane
Standard 1812 TFC membrane for compatible countertop and under-sink reverse-osmosis systems
This 100 GPD thin-film composite reverse-osmosis membrane is a balanced residential replacement for compatible systems using a standard 1812 membrane housing. It offers faster production than lower-output 50 and 75 GPD membranes while remaining suitable for everyday countertop and under-sink drinking-water RO applications.
100 GPDRated membrane capacity
1812 sizeStandard residential format
TFC / TWTap-water residential RO membrane
SKU TW-1812-100Replacement membrane
Application
A balanced everyday choice for countertop and under-sink RO
The 100 GPD rating provides a practical middle ground between slower residential membranes and higher-output 150–250 GPD options. It is suitable for compatible countertop RO systems and standard under-sink systems with or without a storage tank.
Under-sink RO
Residential Drinking-Water Systems
Suitable for compatible tank-based or tankless under-sink systems designed around a 100 GPD membrane and matching flow restrictor.
How it works
Thin-film composite membrane for dissolved-solids reduction
Reverse osmosis uses water pressure to move feed water across a semipermeable TFC membrane. The membrane helps reduce dissolved salts, minerals, metals, nitrate, fluoride, and other membrane-rejectable substances while purified water passes to the product-water side.
Dissolved Solids
Helps reduce overall TDS and dissolved mineral content.
Fluoride
Helps reduce fluoride ions under suitable operating conditions.
Nitrate / Nitrite
Helps reduce nitrate and nitrite in the feed water.
Selected Metals
Helps reduce dissolved metals such as lead, arsenic, chromium, and copper.
Dissolved Minerals
Helps reduce calcium, magnesium, sodium, and other dissolved salts.
Residential Format
Designed for compatible standard 1812 membrane housings.
What 100 GPD means
Rated output is approximately 4.2 gallons per hour under ideal test conditions
GPD means gallons per day. A 100 GPD membrane is rated for approximately 4.2 gallons per hour if operated continuously under its standardized test conditions. Actual household production is normally lower because water pressure, temperature, feed-water TDS, membrane condition, and system design vary.
100 gallons per day under standardized test conditions.
Usually lower than the rated value, especially with colder water, lower pressure, or higher source-water TDS.
GPD describes membrane production capacity, not guaranteed household output. The membrane, flow restrictor, pressure, and system configuration must work together.
Compatibility
Match the membrane rating and flow restrictor to the system
✓
1812 membrane format
The existing membrane housing should accept a standard 1812 residential RO membrane.
The existing membrane housing should accept a standard 1812 residential RO membrane.
✓
100 GPD system configuration
Use as a like-for-like replacement when the current system is designed around a 100 GPD membrane.
Use as a like-for-like replacement when the current system is designed around a 100 GPD membrane.
✓
Matching flow restrictor
The drain-side flow restrictor must be correctly sized for the 100 GPD membrane.
The drain-side flow restrictor must be correctly sized for the 100 GPD membrane.
✓
Proper prefiltration
Sediment and carbon prefilters should be maintained to help protect the membrane from particles and oxidants.
Sediment and carbon prefilters should be maintained to help protect the membrane from particles and oxidants.
Specifications
Verified product details
| Product type | Residential reverse-osmosis replacement membrane |
|---|---|
| Membrane type | Thin-film composite (TFC) |
| Application type | TW / tap-water residential RO |
| Rated capacity | 100 GPD |
| Membrane size | 1812 standard residential format |
| Nominal membrane size | Approximately 1.8″ × 12″ |
| Compatible use | Compatible countertop and under-sink RO systems designed for a 100 GPD membrane |
| Typical service life | Approximately 2–3 years, depending on water quality, pressure, prefiltration, and measured rejection |
| Listed shipping dimensions | 12 × 2 × 2 in |
| Listed weight | MyAquaFilter: 9 oz; MyWaterClub: 0.5 lb / 8 oz — verify packaged weight |
| SKU | TW-1812-100 |
Before ordering
- ✓Confirm the existing membrane is 100 GPD or the system is being correctly reconfigured for 100 GPD
- ✓Confirm the housing accepts an 1812-format membrane
- ✓Confirm the drain-flow restrictor is matched to 100 GPD
- ✓Inspect or replace sediment and carbon prefilters before installing a new membrane
Maintenance
Replace based on age, production rate, and measured rejection
Approximately 2–3 years under normal residential conditions with proper prefiltration.
Consider replacement when purified-water production slows significantly or measured TDS rejection declines.
Installation
Protect the new membrane and flush it before evaluating performance
1
Shut Off and Depressurize
Turn off the feed water and release system pressure before opening the membrane housing.
2
Install and Fully Seat
Insert the membrane according to the housing design and make sure the sealing end is fully seated.
3
Check Prefilters and Restrictor
Confirm that sediment and carbon prefilters are serviceable and that the flow restrictor matches the 100 GPD membrane.
4
Flush Before Use
Run and discard the initial product water after installation, then allow the system to stabilize before relying on TDS readings.
Before purchase
Good to know
!
100 GPD is a rated value
Actual household output is normally lower and depends strongly on feed pressure and water temperature.
Actual household output is normally lower and depends strongly on feed pressure and water temperature.
!
75-to-100 GPD is not automatically a drop-in upgrade
The membrane may fit the same housing, but the flow restrictor and system configuration must also be matched to 100 GPD.
The membrane may fit the same housing, but the flow restrictor and system configuration must also be matched to 100 GPD.
!
Chlorine protection is important
TFC membranes require effective carbon pretreatment to help protect the membrane from oxidant exposure.
TFC membranes require effective carbon pretreatment to help protect the membrane from oxidant exposure.
!
Reduction percentages are not fixed
Actual rejection varies with feed-water chemistry, pressure, temperature, membrane condition, and system design.
Actual rejection varies with feed-water chemistry, pressure, temperature, membrane condition, and system design.
!
1812 and 2012 should not be assumed interchangeable everywhere
Confirm the actual membrane housing dimensions before substituting a different nominal membrane diameter.
Confirm the actual membrane housing dimensions before substituting a different nominal membrane diameter.
!
Not a microbiological purifier
Do not use this membrane alone to make microbiologically unsafe or unknown-quality water safe to drink.
Do not use this membrane alone to make microbiologically unsafe or unknown-quality water safe to drink.
Reduction performance and membrane life depend on source-water chemistry, pressure, temperature, prefiltration, membrane condition, flow-restrictor selection, and system maintenance. This product is not represented as a certified microbiological purifier.
Not sure whether 100 GPD is the correct replacement?
Send the existing membrane label, RO system model, source-water TDS, water pressure, and a photo of the flow restrictor or drain-line assembly.
Send the existing membrane label, RO system model, source-water TDS, water pressure, and a photo of the flow restrictor or drain-line assembly.
Additional information
| Weight | 9 oz |
|---|---|
| Dimensions | 12 × 2 × 2 in |
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