4 Stage 75GPD Plus RO/DI System - Bulk Reef Supply

4 Stage Plus RO/DI System
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  • 4 Stage Plus RO/DI System
  • 4 Stage Plus Parts Kit

4 Stage 75GPD Plus RO/DI System - Bulk Reef Supply

100% Recommend this to a friend (5 of 5)

SKU: 210773
In Stock: 65
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Quick Overview

BRS 4 Stage Systems are perfect for reefers who have water treated with chlorine or relatively clean well water. The 4 stage systems are self-contained on a single bracket making them ideal for tight spaces or where a non-permanent connection may be required. Installing a RO/DI system only takes a few minutes and can be done very easily without any permanent modifications to your home or the plumbing.

4 Stage Plus RO/DI Features:

  • Dual TDS Meter

  • Glycerin Filled Pressure Gauge

  • Pre-installed Automatic shut-off valve

  • Pre-installed Flush Kit

  • Multiple source water connections

  • Drain/waste water connections

  • Mur-lok Push Connect dual EPDM O-Ring fittings

  • 10 Ft Each of 1/4" Blue, Red and Black Tubing

  • Pre-installed NSF Certified Filters NSF Certified


Full Details

NSF Certified BRS 4 Stage Plus RO/DI Owners Manual

NSF CertifiedDow Filmtec Membrane BW60-1812-75


Lifetime Warranty All Bulk Reef Supply RO/DI Systems are covered by our Limited Lifetime Warranty.


Bulk Reef Supply RO/DI systems only use the latest filters and components in Reverse Osmosis technology. We have designed our RO/DI units especially for reef tanks, but they can produce perfect water for other types of saltwater and freshwater aquariums too. If you have a well, or you are connected to city water we provide a variety of RO/DI systems that will fit your aquarium's needs.


4 Stage RO/DI Systems - Perfect for city water that is treated with low amounts of chlorine, or well water with very minimal contaminants.
5 Stage RO/DI Systems - Our most popular system handles most types of well water along with most types of city water treated with chlorine including small amounts of chloramines.
6 Stage RO/DI Systems - If you are not sure what is in your water, or it contains excessive amounts of TDS or hard to remove contaminants like chloramines, phosphates, nitrates, silicates, etc. The BRS 6 Stage systems are designed to treat any water your home may have effectively. The Dual DI stage helps with the hard to remove ions like ammonia, phosphates, silicates, etc.


4 Stages of Filtration

Stage 1

Purtrex 5 Micron Depth Sediment Filter NSF Certified

Sediment filters trap debris and other free-floating particles that would normally clog expensive carbon blocks and foul membranes. Purtrex filters are an actual depth filter with a graded density that progressively gets tighter through as water passes through the filter allowing them to last longer than the competitors.

Stage 2

BRS 5 Micron VOC Block NSF Certified (Chlorine 15,000 @ 1 GPM)

Our VOC carbon blocks are specially formulated to remove and reduce chlorine and volatile organic compounds from household water.

Stage 3

75 GPD Dow Filmtec Membrane NSF Certified (up to 99% rejection rate*)

DOW is hands down the industry leader for residential RO membranes. The 75 GPD Filmtec membrane can remove up to 99% of contaminants from traditional household drinking water. All membranes do require pressure to operate correctly, and DOW's membrane only requires 50 PSI of feed pressure to operate efficiently.
For more info on DOW membranes - Click Here

Stage 4

Nuclear Grade Color-Changing Deionization Resin

Deionization resin is the final stage of the RODI system and can polish your water down to 0 TDS. The DI resin is a mixed bed with a color changing indicator to let you know when it is becoming depleted. The resin starts as a dark blue color that will turn gold when as it becomes exhausted and is a good indicator to let you know when to start looking at your TDS meter.
For more info on Color Changing DI Resin - Click Here


Need Replacement Filters? 4 Stage Chlorine/VOC Filter Kit


BRS RO/DI 4 Stage System Comparison

 BRS 4 Value RO/DI SystemsBRS 4 Plus RO/DI SystemsBRS 4 Plus Water Saver RO/DI Systems
Gallons Per Day
75 GPD
75 GPD
150 GPD
Sediment Filter
Purtrex 5 Micron Depth Sediment Filter 
Purtrex 5 Micron Depth Sediment Filter 
Purtrex 5 Micron Depth Sediment Filter 
Carbon Block
BRS VOC 5 Micron Carbon Block 
BRS VOC 5 Micron Carbon Block  
BRS VOC 5 Micron Carbon Block  
75 GPD Dow Filmtec Membrane

75 GPD Dow Filmtec Membrane

(2) 75 GPD Dow Filmtec Membranes

Single DI Stage with Refillable Cartridge

Single DI Stage with Refillable Cartridge

Single DI Stage with Refillable Cartridge

Auto Shut Off Valve
Canister Wrench
Laundry Tub Connection Adapter
Chrome Faucet Diverter Valve
Chlorine Test Strips  
Glycerin Filled Pressure Gauge  

Flush Kit  
Dual Inline TDS Meter  
Ball Valve  
Drain Saddle Clamp  
EZ Angle Stop Adapter  
Self-Piercing Saddle Valve  
Float Valve    
150 GPD Water Saver Upgrade Kit    
Dimensions 16" x 6.25" x 15.5" 16" x 7" x 15.5" 16" x 7" x 18"


4 Stage Plus RO/DI System Recommended Conditions:

  • Minimum Water Pressure - 50 PSI
  • Max Water Pressure - 90 PSI
  • Recommended Water Temperature - 77°F
  • Recommended Max TDS - <300ppm

Water pressure can be increased by adding a booster pump before your RO/DI system if a pressure increase is required. Low pressure will cause slow production of product water, with excess production of waste water. Pressure over 90 PSI may cause damage to the RO/DI units filters and components.


*DOW Filmtec 75 GPD Membranes have a 96% - 99% typical stabilized salt rejection rate that can be reproduced through the following conditions;

  • Source Water Pressure - 50 PSI / Membrane
  • Source Water Temperature - 77°F
  • Source Water TDS - 250ppm Softened Tap Water
  • Recovery - 15%
  • Minimum Salt Rejection - 96%

For more info on DOW Filmtec BW60-1812-75 Membrane - Click Here


5 Items

  • Great product! By Allen on 9/27/2017

    Great product and well build.
  • Feels solid, no leaks By Erick on 9/18/2017

    I mounted this on my wall with the included brackets and from start to finish everything was solid. When I first received this product I also bought a duel di to go with it and I re did the plumbing I also swapped out the third chamber di with a carbon block. All of which I bought from BRS. I worried that I may be sacrificing some integrity of the build quality that the team at brs already installed. That was not the case because everything is running smoothly and most importantly no leaks and no faulty equipment. I could not be more satisfied and relieved I no longer am at the mercy of my fishstore water or Walmart distilled water. If your in this hobby for the long haul this is the best money can buy so save up or do what I did and build onto one of brs's cheaper options to save even more. Considering the price of gas and price of water to go out every week this is a no brainer. I only wish I could have bought it sooner
  • It's Easy By BigG on 7/24/2017

    Amazing how easy this was to setup. The only thing I neglected to order and then did later was the adjustable floating shut off valve for my storage tank. Have made 250-300 gallons of beautiful, clean "0" TDS RODI water for my new tank setup and qt tank. Highly recommend this one. I really like the pressure gauge and the inline TDS meter.
  • Great Product By Gene on 7/22/2017

    Great Product, no complaints it works as advertised.
  • Great RO/Di Unit! By Steve on 6/20/2017

    Purchased this unit and it works magnificently! Living in Hawaii, our tap water is already pretty good quality, but as expected, this unit brings my TDS to zero. I initially had some leaking fittings, but BRS' customer service took swift action and sent me overnight replacement parts. I could not be happier with their service and this product! I'm glad I went with their unit because it's backed by customer support unlike a lot of the competition.


Ask a question

Product Questions

Does this unit come with the float valve or do i buy it separately?
Question by: Alex Cheshmejiev on May 21, 2017 11:38:00 AM
Hey there,
The 4 Stage Value and Plus unit do not include the float valve, so this would need to be purchased separately.

Have a great day!
Answer by: Zack (Admin) on May 23, 2017 3:17:00 PM
A few things. Just got this up and running, the unit is making a hissing type sound but not leaking. I can't tell what way is off for the flush kit ball valve (what way I should have it when running) cause when it is inline it doesn't make a sound but when it is perpendicular it has a 40psi pressure (double inline).
Question by: Sean Fennig on May 2, 2017 5:56:00 PM
Hey there,
It's not unusual to hear a bit of noise through the unit when it's got water running through it, but this can be much more noticeable when the unit is first started as this comes from little bits of air trapped in the unit. As the unit wears in, much of these air bubbles will get purged from the system and the noise will quiet down. If you are getting a lot of noise initially, moving the unit around a bit, even laying it on its side and tapping it can help to release some of this air and allow it to pass through the system. If you have further questions about your system, please feel free to contact our free customer support by phone or email.

Customer Service- 763-432-9691. Email support@bulkreefsupply.com

Hope this helps!
Answer by: Zack (Admin) on May 8, 2017 11:12:00 AM