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💧 Elevate your water game with pro-grade purity and unmatched reliability!
Max Water's BW-4040 4" x 40" RO membrane offers premium brackish water filtration with a robust 2400 GPD capacity and 99.5% salt rejection. Engineered in the U.S. with advanced thin-film composite technology, it ensures durable, BPA-free performance tailored for North American water conditions. Compatible with leading membrane models and ISO 9001 certified, this membrane is ideal for car wash, industrial, and whole-house applications requiring superior water purity.


















| ASIN | B07ZVYQKTQ |
| Benefits | Removes impurities and contaminants for clean and safe drinking water |
| Brand | Max Water |
| Brand Name | Max Water |
| Customer Reviews | 4.2 out of 5 stars 28 Reviews |
| External Testing Certification | ISO 9001 |
| External testing certification | ISO 9001 |
| Item Dimensions D x W x H | 10.2D x 10.2W x 101.6H centimetres |
| Item Weight | 3.63 kg |
| Item weight | 3.63 kg |
| Manufacturer | Max Water Canada |
| Manufacturer Part Number | 104299 |
| Material | Polyamide Thin-Film Composite |
| Material Type | Polyamide Thin-Film Composite |
| Model Number | BW-4040 / TW30-4040 2400 GPD |
| Number of Items | 1 |
| Product benefits | Removes impurities and contaminants for clean and safe drinking water |
| Product dimensions | 10.2D x 10.2W x 101.6H centimetres |
| Unit Count | 1.0 count |
A**C
works good
Using it in my whole house RO system. works like original
B**N
Works great and a lot cheaper than buying it from a professional window cleaning store
These are great to use for helping improve the purity of water. It essentially helps purify the water down to 90 or 95% purity which is fantastic and it lasts you forever. We’ve only bought it this year so we don’t know how long it last but if you take good care of it, it should last a good five maybe seven years.
J**N
Does the job
I Use this item on my water conditioning machine. Lasts up to one year
D**E
Garbage membrane
Installed this membrane and right out of the package it would not produce any permeate. Membrane was installed as per RO systems instructions. Spoke to systems manufacturer and was told membrane was defective. Emailed RO membrane distributor and they were very quick to point fingers as to it not been the membrane. The water this membrane is allowing through is still full of iron and very hard. Would not recommend this product or the distributor as they don’t stand behind there product
C**S
Lasted Less Than 30 Days
We used this as replacement membrane in on whole house RO system and it failed in less than a month. Previous membranes have lasted a year or more. Support tried to blame our system until we sent them our setup and then they said there is no warranty because of a "high likelihood of factory failure"
Trustpilot
5 days ago
1 month ago