For industrial and commercial water treatment systems, the quality of the membrane element determines the efficiency and purity of the final output. The Applied Membranes (AMI) M-B Series stands out as a robust solution for brackish water reverse osmosis (BWRO) applications. These membrane elements are engineered to handle the rigorous demands of commercial filtration while delivering consistent high rejection rates and flow performance.
At Purecowater, we understand the critical nature of reliable filtration components. This guide details the specifications, features, and applications of the AMI M-B Series to help facilities managers and engineers select the right solution for their water treatment needs.

What is the AMI M-B Series?
The AMI M-B Series consists of thin-film composite reverse osmosis elements designed specifically for brackish water. Unlike standard tap water membranes, these elements are capable of filtering water with higher dissolved solids (TDS) often found in well water, municipal sources, and light industrial wastewater.
A defining feature of the M-B Series is the hard fiberglass (FRP) exterior. This outer shell provides superior structural integrity compared to tape-wrapped elements, allowing the membrane to withstand higher pressure drops and prevent physical damage during operation or installation.
Key Features and Benefits
- High Salt Rejection: Delivers up to 99.5% stabilized salt rejection, effectively reducing TDS, chlorides, lead, and other dissolved impurities.
- Robust Construction: The fiberglass shell ensures durability in challenging operating environments.
- Versatile Sizing: Available in standard industrial sizes ranging from 2.5″ x 14″ to 4″ x 40″ and larger.
- Made in the USA: Manufactured in ISO 9001:2015 certified facilities, ensuring strict quality control.
- Energy Efficiency Options: The series includes “LE” (Low Energy) models that operate at reduced pressures (150 psi) to lower electricity costs.
Product Specifications
The AMI M-B Series is divided into standard high-rejection models and low-energy models. Below are the performance metrics for the most common industrial sizes.
Standard Brackish Water Elements
These models are designed for standard operating pressures (typically 225 psi) and offer maximum durability and rejection.
| Model No. | Size (Dia” x Len”) | Flow Rate (GPD) | Min. Salt Rejection |
|---|---|---|---|
| M-B2514A | 2.5″ x 14″ | 200 | 99.5% |
| M-B2540A | 2.5″ x 40″ | 1,000 | 99.5% |
| M-B4040A | 4.0″ x 40″ | 2,400 | 99.5% |
| M-B4040AHF (High Flow) | 4.0″ x 40″ | 3,000 | 99.5% |
Low Energy (LE) Elements
Optimized for lower pressure operation (approx. 150 psi), these elements reduce pump energy consumption while maintaining high permeate quality.
| Model No. | Size (Dia” x Len”) | Flow Rate (GPD) | Operating Pressure |
|---|---|---|---|
| M-B2540ALE | 2.5″ x 40″ | 1,000 | 150 psi |
| M-B4040ALE | 4.0″ x 40″ | 2,900 | 150 psi |
Applications for Industrial M-B Series Membranes
Due to their versatility and high rejection characteristics, the M-B Series membranes are suitable for a wide range of industries including:
- Food & Beverage: Production of ingredient water, bottling, and ice manufacturing.
- Medical & Pharmaceutical: Pre-treatment for ultra-pure water systems and hospital sterilization units.
- Commercial: Spot-free rinses for car washes, window cleaning, and laundry operations.
- Manufacturing: Boiler feed water, humidification systems, and general process water.
- Municipal: Drinking water purification for small to medium-sized communities.
Why Choose Fiberglass Wrapped Elements?
In industrial settings, RO housings can be subject to hydraulic shocks and uneven pressure distribution. Tape-wrapped elements are more susceptible to deformation under these conditions. The FRP (Fiberglass Reinforced Plastic) hard shell of the AMI M-B Series ensures the element maintains its shape, seal integrity, and structural strength even when subjected to higher pressure drops across the vessel.
Get Technical Support & Pricing
Purecowater specializes in industrial liquid filtration solutions. Whether you need to replace existing elements or design a new filtration skid, our team can assist with sizing, compatibility, and procurement.
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