4 Stage Value 100GPD RO/DI System
This System is Best For: City water treated with low levels of chlorine and well water with low levels of contaminants.
The 4 Stage Value 100GPD RO/DI System gives hobbyists a simple, dependable way to make purified water at home. Instead of making trips to buy water at the grocery or local fish store, you can produce clean RO/DI water whenever you need it; no hauling buckets required. RO/DI water is essential for topping off evaporation and mixing fresh saltwater for water changes.
It removes common tap water contaminants and is an affordable option for owning your own RO/DI system, while producing more water per day vs more common 75GPD models.
4 Stages of Filtration
Sediment Filter
Included Filter: 5 Micron Depth Sediment Filter
Removes larger particles such as dirt, rust, sand, and other debris from the incoming water supply. This first stage helps protect and extend the life of downstream filters like the RO membrane.
Carbon Block
Included Filter: BRS 5 Micron VOC Carbon Block
Removes chlorine and many organic compounds that may be present in tap water. This stage helps protect the RO membrane from damage while also reducing chemical contaminants.
RO Membrane
Included Filter: DOW Filmtec 100 GPD Membrane
Acts as the core filter of the system by removing the majority of dissolved contaminants (TDS) from the water. Under pressure, purified water passes through the membrane while impurities are rejected into a separate waste-water tube.
Deionization Resin
Included Filter: BRS Color Changing Mixed Bed DI Resin
Deionization resin is the final stage of the RODI system and will 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.
No Plumbing Experience Required
Setting up a BRS RO/DI system is easy. If you can connect a garden hose to your spigot, you can install an RO system.
This system includes the following accessories to get you up and running quickly:
Garden Hose / Utility Sink Adapter
Connect your RO system directly to a standard garden hose or utility sink thread. This option is great for dedicated mixing stations, laundry rooms, garages, or outdoor use.
Faucet Diverter Valve
The faucet diverter valve allows you to temporarily connect the RO system to most kitchen or bathroom faucets. With the turn of a lever, you can switch between normal faucet use and supplying water to the RO system.
Faucet Adapters
Multiple faucet adapters are included to help fit a wide range of standard kitchen faucets. These adapters make it easy to attach the diverter valve securely so you can get up and running quickly.
Easy Setup Guide: How to Install a BRS 4-Stage RO/DI System
Limited Lifetime Warranty
Built to Last. Backed for Life.
Bulk Reef Supply RO and RO/DI systems are carefully assembled and tested in Golden Valley, Minnesota. Every system is built using proven filtration components and designed to deliver reliable performance for years of use.
Because we build and support these systems ourselves, we stand behind them with confidence. If you ever run into an issue, our team is here to help troubleshoot, answer questions, and make sure your system continues to perform the way it should.
All Bulk Reef Supply RO/DI systems are covered by our Limited Lifetime Warranty.
FAQs
How Does an RO/DI System Work?
Reverse osmosis systems purify water by passing it through multiple filtration stages that each have specific roles in removing contaminants before the water reaches your storage container.
The star of the show is the RO membrane. Using your home's water pressure, purified water is pushed through the membrane while impurities are rejected into a separate waste-water tube.
Standard RO systems use three primary filtration stages to remove sediment, chemicals, and dissolved contaminants. RO/DI systems add a fourth stage of deionization resin that further purifies the water and acts as a final polish to ensure zero total dissolved solids (TDS).
How Many Stages Do I Need?
While water quality can vary wildly from one source to the next, we've come up with some good rules of thumb for when each system makes sense.
RO Only
Best For:
When 0 TDS water isn't necessary
RO only systems remove low levels of chlorine and most contaminants to produce very clean water, but they don't include a DI stage to polish the water to 0 TDS. For saltwater and reef aquariums in particular, RO/DI systems are typically recommended.
4 Stage RO/DI
Best For:
City water with low levels of chlorine or well water with low levels of contaminants
A simple and effective RO/DI system that removes sediment, low levels of chlorine, dissolved contaminants, and polishes the water to 0 TDS for reef aquariums.
5 Stage RO/DI
Best For:
Nearly any city or well water, whether it's treated with chlorine or chloramines
Adds an additional carbon stage vs. the 4 stage system to help fully remove chloramines before the water reaches the RO membrane, protecting both the membrane and DI resin.
6 Stage RO/DI
Best For:
Nearly any city or well water, plus hobbyists who want longer DI resin life
Includes an additional DI stage vs. the 5 stage system to help extend resin life and maintain consistent 0 TDS water production.
7 Stage RO/DI
Best For:
Nearly any city or well water, plus maximum DI resin efficiency
Separates cation and anion DI resins before utilizing a final mixed-bed DI stage. This three DI stage approach allows you to replace only the resin type that has been exhausted.
How Do I Know When to Replace the Filters?
Filter replacement depends on three main factors:
- How much water you're producing
- The quality of your source water
- The types of contaminants in that water
Here are a few simple ways to know when each stage needs attention:
Sediment Filter
As the sediment filter begins to clog with debris like rust, sand, and dirt, the pressure entering the RO membrane will start to drop. If your system has a pressure gauge, it's time to replace the sediment filter when you start seeing a decrease in pressure. If your system doesn't have a gauge, we recommend proactively changing out your sediment filter every 6-12 months or so
Carbon Block
Carbon filters are harder to monitor directly, so they are usually replaced on a schedule. Most hobbyists change them every 6 to 12 months. If your water supply contains chloramines or you produce large amounts of RO/DI water, replacing them closer to every 6 months is recommended.
RO Membrane
The RO membrane typically lasts around 3 years when the sediment and carbon filters are replaced regularly. You can also monitor performance by comparing the TDS of the incoming water to the TDS after the membrane. Most membranes reject about 98% of dissolved solids. For example, if the incoming water measures 100 TDS, the water leaving the membrane should be close to 2 TDS.
DI Resin
This is the final stage that brings your water down to 0 TDS. If the water leaving the system reads above 0 TDS, the resin is exhausted and should be replaced. If you do not have a TDS meter, color-changing DI resin provides a visual indicator. Replace the resin just before the color change reaches the top of the cartridge.
What Makes BRS RO/DI Systems Better?
Bulk Reef Supply RO/DI systems are designed with aquarium hobbyists in mind and are built with proven filtration components. Every system is carefully assembled and tested right here in Golden Valley, Minnesota so we can maintain strict quality control over every system we produce.
Unlike many generic RO systems, BRS systems use high-quality components, including premium RO membranes, refillable DI cartridges, and industry-leading carbon blocks designed to protect the membrane and extend system life. Double O-ring push connect fittings help ensure a tight seal and reduce the chances of leaks for added peace of mind.
BRS systems are also designed to be easy to monitor and maintain. The "Plus" models have built-in features like pressure gauges, flush valves, and TDS meters help you quickly verify that the system is operating properly and producing pure water for your aquarium.
Finally, every BRS RO/DI system is backed by a limited lifetime warranty, extensive educational resources, and knowledgeable support. From installation guides to troubleshooting help, the BRS team is here to make sure your system continues producing clean, reliable water for years to come.
Specifications
4 Stage Value 100GPD RO/DI System
| Water Production | 100 Gallons Per Day |
|---|---|
| System Type | Standard - Single Membrane |
| Waste to Product Water Ratio | Approx. 3:1 |
| Ideal Water Source | City Water - Chlorine Only | Well Water - Low Pollutants |
| Sediment Filter | 5 Micron Depth Sediment Filter |
| Carbon Block | BRS VOC 5 Micron Carbon Block |
| RO Membrane | 100 GPD Dow Filmtec Membrane |
| DI Resin | Single Mixed Bed DI Stage with Refillable Cartridge |
| Dimensions | 16" x 7" x 15.5" |
Recommended Conditions
| Minimum Water Pressure | 50 PSI |
|---|---|
| Maximum Water Pressure | 90 PSI |
| Ideal Water Temperature | 77°F |
What’s Included
4 Stage Value 100GPD RO/DI System
- Automatic Shut-Off Valve
- 550ml/min Flow Restrictor
- Chrome Faucet Diverter Valve
- Garden Hose/Utility Sink Adapter
- Source Water Adapters
- 1/4" Blue RO Tubing (10 feet)
- 1/4" Red RO Tubing (10 feet)
- 1/4" Black RO Tubing (10 feet)
- Canister Wrench
Pre-Installed Filters
- 5 Micron Depth Sediment Filter
- BRS 5 Micron VOC Block
- 100 GPD DOW Filmtec Membrane
- Color-Changing DI Resin
| SKU | 211559 |
|---|---|
| UPC | 853710007520 |
| Manuals | |
| Aquarium Type | Saltwater, Freshwater |
| Stages | 4 Stage |
| Production Rate | 100 Gallons per Day |
| Waste:Product Water | Standard (3:1) |
| Dimensions | 16" x 6.25" x 15.5" |
| Filter Dimensions | 10 in. x 2.5 in. (Standard) |
| Tubing Length | 10 Ft Each of 1/4" Blue, Red and Black Tubing |
| Included Filters | Sediment Filter, Carbon Block, RO Membrane, DI Resin (Mixed Bed) |
| Included Accessories | Faucet & Garden Hose Connections |
| Warranty | BRS Limited Lifetime Warranty |
| Carbon Block Type | Chlorine |
| Sediment Filter Type | True Gradient Technology |
| Membrane GPD | 100 |
| Micron Rating | 5 |
| Resin Type | Color Changing |
| Water Supply Connections | Garden Hose / Laundry Tub |
BRS 4 Stage RO/DI System Instructions
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