Is there a difference in product between model numbers tw30-1812-50d, tw30-1812-50, and tw30-1812-50 gpd tfc?

Not really, they are all the same size and 50 gpd membranes. Different companies have different part numbers for them. The D on one is for dry pack, in which almost all are dry pack you will see. There are some wet pack but you do not see them often. Both are the same and work the same. The tfc just means thin film composite in which all these are the same, they are tfc

Dow website shows only "tw30-1812-50hr". this one is missing "hr". what is the difference ?

I am not positive but I believe the last digit is the maximum flow rate of the RO in gallons per hour.

What is the difference between the tw30-1812-50 and the tw30-1812-36 membrane? thanks.

The tw30-1812-50 will produce 50 gpd (gallons per day) of filtered water. The other is rated to filter 36 gpd. These are not interchangeable, as your system has to have a flow restrictor to match the flow specification of the membrane. There is a good explanation of this on www.waterfiltersonline.com.

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Dow Filmtec TW30-1812-50 Reverse Osmosis Membrane , Blue

Product ID: 17413330

Details

Material
Polyamide
Product Dimensions
1.75"D x x
Item Weight
181 Grams
External Testing Certification
NSF
Product Benefits
Produces 50 of

💧50 GPD Purification

📏Fits Standard 1.8"x12" Housings

🛡️98% Salt Rejection

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VT16398

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Description

💧 Elevate your water game with the industry’s most reliable RO membrane!

SALT REJECTED - Achieves an impressive 98% stabilized salt rejection, ensuring superior water purity.
CERTIFIED CONFIDENCE - NSF/ANSI Standard 58 listed for trusted, verified water filtration quality.
SEAMLESS FIT ZERO HASSLE - Designed to fit standard 1.8" x 12" RO membrane housings for easy installation.
PURE PERFORMANCE EVERY DROP - Delivers up to 50 gallons of crystal-clear water daily, perfect for your home hydration needs.
BUILT TO LAST ENGINEERED FOR YOU - Advanced polyamide thin-film composite membrane resists chlorine damage with recommended pre-filters.

The Dow Filmtec TW30-1812-50 is a premium reverse osmosis membrane engineered for home water purification. It produces up to 50 gallons per day with 98% stabilized salt rejection, fitting standard 1.8" x 12" housings. NSF/ANSI Standard 58 certified, this blue polyamide thin-film composite membrane ensures consistent, high-quality water filtration, making it the go-to choice for health-conscious professionals seeking reliable hydration solutions.

Specifications

Material	Polyamide Thin-Film Composite
Product Dimensions	1.75"D x 11.75"W x 1.75"H
Item Weight	181 Grams
External Testing Certification	NSF
Product Benefits	Produces 50 Gallons per Day of Purified Water at 99% Salt Rejection
Brand	Dow Filmtec
UPC	826333000407 809390006797 851905124786 885199792703 163120791897 689466099058 808112764205 799705704152 132017518428 700999871734 115971042208 807032976118 786514667204 182682390089 798527533063
Global Trade Identification Number	00163120791897, 00689466099058
Unit Count	1.0 Count
Number of Items	1
Manufacturer	Dow Filmtec
Part Number	TW30181250
Item Weight	6.4 ounces
Item model number	TW30-1812-50
Is Discontinued By Manufacturer	No
Size	1 Count (Pack of 1)
Color	Blue
Item Package Quantity	1
Temperature Range	113 Degrees Fahrenheit
Batteries Included?	No
Batteries Required?	No

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