---
product_id: 67925510
title: "RO and Housing Set (400 GPD)"
brand: "membrane solutions"
price: "VT28924"
currency: VUV
in_stock: null
reviews_count: 3
url: https://www.desertcart.vu/products/67925510-ro-and-housing-set-400-gpd
store_origin: VU
region: Vanuatu
---

# ANSI, NSF certified 400 GPD 0.1nm filtration RO and Housing Set (400 GPD)

**Brand:** membrane solutions
**Price:** VT28924
**Availability:** ❌ Out of Stock

## Summary

> 💦 Purify Your Life, One Drop at a Time!

## Quick Answers

- **What is this?** RO and Housing Set (400 GPD) by membrane solutions
- **How much does it cost?** VT28924 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/67925510-ro-and-housing-set-400-gpd)

## Best For

- membrane solutions enthusiasts

## Why This Product

- Trusted membrane solutions brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smart Design:** Compact dimensions for easy installation under your sink.
- • **Rapid Filtration:** Get a gallon of purified water in just 3 minutes!
- • **Unmatched Purity:** Removes 97% of contaminants for peace of mind.
- • **Transform Your Water:** DIY RO system for ultimate customization!
- • **Quality You Can Trust:** 100% performance tested for superior reliability.

## Overview

The Membrane Solutions 400 GPD RO Membrane is a high-performance reverse osmosis system designed for DIY enthusiasts. It produces 400 gallons of purified water per day, effectively removing up to 97% of total dissolved solids with its advanced 0.1nm filtration technology. Certified by ANSI and NSF, this system ensures top-notch quality and reliability, making it an essential addition to your home drinking water setup.

## Description

Full description not available

## Features

- [DIY RO System] What You'll Get: 400 GPD RO Membrane*1, 12" X 3.0" Membrane Housing*1, Wrench*1, Quick Connect Fittings*3. Make your own reverse osmosis water filter right now! You don't need to buy an expensive all-in-one solution.
- [400 Gallon Per Day] Membrane Solutions High-Quality Reverse Osmosis membrane can produce 400 gallons purified water per day (16.6 gallons / 63.1 liters per hour). 8 glasses of 8oz cups of water are recommended 1 gallon. You can get a gallon of water in about 3 minutes. You just need to open the faucet of the RO purifier using this RO membrane, you can get drinking water.
- [High Contaminant Rejection] Remove up to 97% of total dissolved solids from water. This membrane is only 0.1nm, 50 times smaller than even the heavy metals. So these RO membranes can easily remove heavy metal, harmful minerals and other soluble salts from water. Enjoy Your Water with Confidence!
- [100% Performance and Quality Tested] Membrane Solutions RO membrane uses the most advanced membrane film technology and manufacturing processes, verified by independent laboratory testing. These reverse osmosis membranes are made of the highest quality Polyamide Thin-Film Composite ensures that you get the most filtration and surface area coverage, let you enjoy high-quality taste.
- [About RO GPD Ratings] GPD ratings are based on tests performed under specific water conditions (Urban tap water, 25°C / 77 °F, 100 PSI). Every time the temperature drops by 1°C / 33.8°F, the GPD Rating drops by about 3-4%; every time the pressure drops by 1 PSI, the GPD Rating drops by about 1 - 1.5%. For example, a standard 400 GPD RO membrane, at a temperature of 10°C / 50°F (or a pressure of 50 PSI), the GPD Rating is about 200.
- Tips: Recommend work pressure is 100 psi when using this product in a Maple Syrup reverse osmosis system. And we suggest heating and maintaining the raw sap at 104°F(40°C) to prevent clogging on the membrane while keeping it under 113°F(45°C) to avoid damage to the membrane due to over-high temperature.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Weight | 0.01 Ounces |
| Item Dimensions D x W x H | 2"D x 2"W x 12"H |
| External Testing Certification | ANSI, NSF |
| Material Type | abs, frp |

## Product Details

- **Material:** Acrylonitrile Butadiene Styrene (ABS), frp
- **Product Dimensions:** 2"D x 2"W x 12"H
- **Item Weight:** 0.01 Ounces
- **External Testing Certification:** ANSI, NSF
- **Product Benefits:** High rejection rate, lower TDS, standard size, for home and semi-commercial use, maple syrup DIY, aquariums, etc.

## Images

![RO and Housing Set (400 GPD) - Image 1](https://m.media-amazon.com/images/I/616y97g+J8S.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: Does it constantly discharge reject water even when your not using pure water**
A: YES, you need to close both outputs or water will discharge from the brine. To stop it from running constantly most use an ASV (Automatic shutoff valve). You will also need a flow restrictor on the Brine, sized appropriately for the RO membrane

**Q: what is the wastewater to purified water ratio? can the flow restrictor be bypassed to flush?**
A: The purified water to wastewater ratio is 1/2.

**Q: Why waste water line seems to be running a lot of water ?**
A: Waste water is usually 1gallon RO/DI to 2 to 4 gallons waste. I brought my waste to 1 -2 gallaons of waste to 1 gallon Ro/DI with a booster pump. I also added and upgradeed from 100G to 200Gallon system. Just added another 100G ro/di canister.  use the waste water for plants, and garden. If ypu can get waste tube to go out and into a diffrent barrel or yard, you can recycle it. booster pump helps to reduce the waste, unfortunately there is no other way to completely reduce it to zero. good luck.

**Q: Can you suggest asov for the 400g system?  it has 3/8 input x 1/4 output - all of the asov on amazon are 1/4 x 1/4 or (rare) 3/8/ x 3/8**
A: Chemo “Harrington Plastics “ online

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good production, missing RO check
*by D***H on August 1, 2023*

We have very hard well water here, and have to RO all of our drinking, cooking, and gardening water. I have owned two packaged systems and built 3 from scratch for myself, family, and neighbors, so I have a lil bit of experience on what works and what does not.I upgraded from 2x 150GPD rated membranes that had been in service for nearly 2 years to this membrane. Very good production in the first 3 days in service. No RO membrane I have ever tried produces 100% of its label value under home pressure and temperature conditions. If you're getting 50% of label you're doing great, 30% of label is pretty normal. I am guessing I am getting about 120GPD actual output from this membrane, which is like 30% of label, so I am pretty satisfied.Injection is 80 psi, ~15C temp, ~1200ppm 7.4pH well water, and I get about 30ppm finished water. So if you're wanting this for super polished water for aquariums, its probably not a good choice. But for home drinking and cooking and gardening water, it is a great choice. A few minerals left in it helps to keep the pH from crashing too low once the water gets a chance to interact with the CO2 from the air to make carbonic acid.Suggestion to Membrane Solutions: add the integrated check valve fitting instead of just a straight elbow!Wrap all the fittings in PTFE tape! I usually do 6 wraps of .35 thickness, but you probably want 10 wraps on these fittings as the threads have a lot of clearance with the housing.Overall, great value for money. Think I will be sticking with Membrane Solutions brand from here on out.

### ⭐⭐⭐⭐⭐ Upgrading my review from 1 star to 5 star based on new information.
*by D***1 on October 22, 2020*

I originally gave this "DIY" RO filter and pressure vessel kit a one star rating because 99% of the water went out the waste (brine) outlet and there were only drops coming from my RO faucet.Well I didn't have everything I needed to get a usable amount of RO filtered water which would be being able to fill an eight ounce glass of water in less than a minute (vs a frikin day). With this 400GPD RO kit I was expecting to fill that glass in maybe 15 - 30 seconds based on what I have seen with a few of the full RO systems costing around $300-$400 that some of my neighbors had.After dealing with the seller's representative I would also give the seller (and his rep) a five star rating.The end result is that I am now getting the output I expected. As was my original review this new updated one is a bit 'wordy' . . .The reason I didn't get the expected output was more because of my lack of knowledge of RO systems. First of all in my defense for the scathing review and one star rating I gave I must point out that this is being marketed as a DIY kit. In my opinion it is not a DIY system - at least not a complete DIY. However it is a very good deal for a 400GPD filter kit that a Do It Yourselfer would need and want to build a complete RO system.To me a DIY product (stating "Make your own reverse osmosis water filter right now!") implies all I need to do is add these components to an existing filtered water line and feed the permeate RO filtered output to a dedicated faucet on my sink. While I didn't expect this kit to come with a RO faucet and some of the other parts I would need; I did (and still do) think this DIY kit marketed as it is should come with everything needed to put water into the RO pressure vessel and get a usable amount of RO filtered permeate water.However you need one more very critical component to get a usable amount of RO filtered water. That component is a Flow Restrictor (FR). With the Flow Restrictor you will be lucky to get even drips of RO filtered water. Without the Flow Restrictor there will be no back pressure to force water through the internal RO membrane and most if not all of the water will take the path of least resistance (practically no resistance) and go out the waste (brine) outlet of the pressure vessel. Basically this is why the container where the RO filter is placed is called a "Pressure Vessel" in the first place.Flow Restrictors (FR) are rated in what amount of restriction they place on the flow. It's not a 'one size fits all' deal. You need different sized FRs for different sized RO filters (50GPD, 75GPD, 100GPD and 400GPD etc.). Simply stated the amount of restriction needed is based on what you are putting in and and what you can except as an output. So there is a ratio if input to output. There are many more variables and it is more complicated than that but this is what it all boils down to.For most RO systems for every 3-4 gallons or raw unfiltered water you put in you get 1 gallon of RO filtered water out the permeate output. The other 2-3 gallons goes out the brine (waste) output and 'down the drain' so to speak. In the US where water is cheap and plentiful in most places some people might use the waste water output for watering the lawn, garden or taking baths or whatever other purposes. It's usually not 'bad' water coming out the waste output as the term waste implies.Also, If you don't want to have to open and close the input water line every time every time you open the faucet get some RO filtered water another component you will want is an (optional) Automatic Shut Off Valve (ASOV of ASO). If you are feeding the water into a holding tank or reservoir of some sort you would need at the least a float valve so that once the tank is full the input to the to the RO filter shuts off. This would actually be another type of ASOV.I only want RO water to drink where from what I understand a lot of people use RO water for aquariums, making maple syrup, hydroponic gardening etc. and use a more manual based system and may not use an ASOV - but I think that nearly all RO systems do and should.I did a LOT of online research before I bought any of the components to build my RO system and nowhere that I look was it pointed out that the FR is a critical component nor was a FR even mentioned.I already had a somewhat sophisticated filtration array in addition to a basic water softener for my rust colored well water with a very high amount of Totally Dissolved Solids (TDS). Bare in mind that a water softener does not remove any TDS it only exchanges the dissolved calcium and magnesium etc. solids of with sodium based dissolved solids so you still end up with about the same amount of TDS at the output as you had at the input.For washing clothes and showering the sodium based TDS was not a major concern for me but I didn't want any TDS or other crap (almost literally) in my drinking water. I should add that you DO want some calcium, magnesium and other TDS in your drinking water because your body does need some minerals. Unfortunately RO filters or 'throws out the good with the bad'. They actually make another 'filter' that adds back 'good' minerals into the RO filtered water after the RO filter. However you don't want a lot of other TDS in drinking water and some are very bad for your health.At the time I bought this 400GPD kit it did not come with a Flow Restrictor and the seller did not even sell them . . . or mention that one would be needed. In my correspondences with the seller I pointed this out. The seller contacted me after reading my review to find out what the problem was and replaced the kit at no additional charge. I have left a lot of bad and good reviews for many of my Amazon purchases I was impressed that the seller did so being for me this is not a common practice. I would rate the seller with 5 stars also.

### ⭐⭐⭐⭐⭐ Great customer service and product
*by C***E on August 1, 2025*

No fault of the seller, the package was delivered to the wrong house, and it wasn't a neighbor. Contacted FedEx to try to find it. They closed the case before completing it, and I had to call and complain. They reopened it to say a couple days later, we can't find it. Membrane Solutions quickly responded to me after I reached out & provided case and tracking. They quickly had another package in route. Good customer Service, and the product works Well. I've been using them for a few years for a Whole Home RO system.

## Frequently Bought Together

- Membrane Solutions 400 GPD RO Membrane, Reverse Osmosis Membrane with Membrane Housing, 1/4" Quick-Connect Fittings, Check Valve, Replacement for Under Sink Home Drinking RO Water Filter System
- Malida Stainless Water Pressure Test Gauge, Water Pressure Detector for Aquarium Meter 0-1.6MPa 0-220psi Reverse Osmosis System Pump with 1/4.
- Malida 1/4 inch O.D. Length 32.8ft(10 meters) RO Water Tubing, Hose Pipe for RO Water purifiers System,+ 1/4 O.D quick connector 10pcs

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-02-08*