CSM RE1812-50
Reverse Osmosis (RO) Membrane

CSM RE1812-50 (50 GPD) RO Membrane

CSM RE1812-50 (50 GPD) RO Membrane

Our Price: US$14.99

(In Stock)

(0 Reviews)
Be the first to write a review.

Found a Lower Price?
Request a Price Beat
Free Shipping on orders over $79

Lowest Price Guaranteed on the CSM RE1812-50 (50 GPD) RO Membrane

economical 50 GPD replacement reverse osmosis (RO) membrane element for under sink residential RO systems

The CSM RE1812-50 is a very popular replacement RO membrane that fits in most 50 gallon per day (50 GPD) residential reverse osmosis systems.

This thin-film composite (TFC) membrane has a minimum salt rejection rate of 96% (98% expected) based on a 200 mg/l(ppm) NaCl solution at 60 psi applied pressure and 15% recovery.

  • very econmical, brand-name membrane
  • far high rejection rates, greater durability and life as compared to cellulose (CTA) membranes
  • high pH range tolerance
  • shipped dry for convenient handling and long shelf-life
  • NSF/ANSI Standard 58 listed
  • best price guarantee

CSM RE1812-50 residential RO membrane elements fit most standard nominal 2-inch I.D. pressure vessels. Accordingly, CSM RE1812-50 membranes will fit in most residential RO membrane housings, regardless of brand! Be sure to match capacities, not just physical size to ensure proper performance. Compare measurements below to confirm.

CSM RE1812-50 RO Membrane Specifications
Model Membrane Type Dia x Length Test Pressure Capacity (GPD) Rejection Rate
RE1812-50 Polyamide Thin-Film
Composite (TFC)
1.8 x 12" 60 psi 50* 98%**

* Capacity (permeate flow) and salt rejection based on the following test conditions: 200 ppm softened tap water, 77F (25C), 15% recovery and the specified applied pressure. Capacity for individual elements may vary.
** Minimum salt rejection is 96.0%.

Dimensions - Inches (mm)

0.67 (17)
0.9 (22)
11.7 (298)
0.9 (22)
1.8 (45)

CSM-RE1812-50 Size Chart
Recommended Operating Conditions:
Maximum Operating Temperature:113F (45C)
Maximum Operating Pressure:150 psi (10 bar)
pH Range, Continuous Operation:2-11*
Maximum Feed Silt Density Index (SDI):5
Free Chlorine Tolerance:< 0.1 ppm**

*Maximum temperature for continuous operation above pH 10 is 95F (35C).

**Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Since oxidation damage is not covered under warranty, we recommend removing residual free chlorine by pretreatment prior to membrane exposure. Most RO systems have carbon pre-filters for this purpose.

Important note about selecting the correct membrane capacity: All RO systems use a drain line flow restrictor to create pressure against the RO membrane. This pressure is critical to the performance of the RO system. If the drain line flow restrictor is not correctly matched to the capacity rating of the membrane, problems such as slow or ceased water production or high water waste can result. Select a replacement membrane that matches the capacity rating of your existing membrane and system. If you want to upgrade to a higher capacity membrane to increase the rate and quantity of daily water production, it is critical that you upgrade both the membrane AND the drain line flow restictor. Contact us for assistance.

Notice: The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system.