5 Stage 100 gpd Reef Aquarium RO/DI Reverse Osmosis System + Float Valve (optional)
5 Stage 100 gpd Reef Aquarium RO/DI Reverse Osmosis System + Float Valve (optional)

5 Stage 100 gpd Reef Aquarium RO/DI Reverse Osmosis System + Float Valve (optional)

CAD $275.00
CAD $240.00
Part Number: 101044
In Stock

Choose Options

50GPD 104092 (-10.00)
100GPD 104094 (10.00)
150GPD 104098 (25.00)
200GPD 104097 (40.00)
DI Filter Size
upgrade to 2.5" Inline DI Filter (7.00)
Float Valve Part
ADD Float Valve Part (22.00)
SAVE ON Additional Filters and Accessories:
Booster pump:
50 to 75 GPD and accessories 105715 (160.00)
100 GPD and accessories 105716 (170.00)
Booster Pump 200 GPD and accessories (190.00)
*We'll ask for shipping info at checkout

This system is ideal for all beginners and midrange levels of reef aquarium owners and some professionals. You can get an absolute 99.99 pure water with 00 PPM, you can also add a side reservoir tank and control the auto-filling and shutting off  the system by using the float valve 105369 

You can produce up to 700 gallons of RODI if you offer good maintenance to your RO system and refill the DI filter on time when starts shrinking during use. DI resin should be always intact to prevent the cation and anion resins get apart, once they get apart the filter fails and you should change the media.

for more information about the filter, life check 104050 

Remember always bypass the DI filter stage when you make flushing to your RO system during filter setup of filter changes.

Detailed Description:

5-Stage Saltwater Aquarium RODI Unit with Float Valve

Producing 99.99% pure water, this is a great system if you are looking for a reverse osmosis unit for your saltwater aquarium or hydroponics setup. Included float valve shuts off the system when your tank is full.

Please Note: For higher capacity configurations (150 GPD or more) we highly recommend adding a booster pump to achieve maximum output from the system.

Tank and faucet are not included with this system

Stages of Filtration:

  • 1st Stage: 1 Micron Polypropylene Sediment Filter 104001
  • 2nd Stage: Granular Activated Carbon (GAC) Filter 104004
  • 3rd Stage: 5 Micron Carbon Block (CTO) Filter 104005
  • 4th Stage: Stage: TFC 50GPD RO Membrane 104092
  • 5th Stage: Refillable Inline Mixed Bed DI Filter 104050

Note: Our Refillable DI Cartridges can be refilled with our bulk DI resin (part #104135-5)


  • Bad Tastes and Odors
  • Lead
  • Flouride
  • Chlorine
  • Copper
  • Cysts (Cryptosporidium, Giardia, Entamoeba & Toxoplasma)


  • 5-stage RO/DI Unit
  • Selected RO Membrane (Price may vary)
  • One set of installed pre-filters
  • Housing wrench and installation accessory pack
  • Optional Booster Pump if selected (Price may vary)
  • Float Valve Part #105369


  • The rejection rate of 99.99% of TDS‡ after the DI Stage
  • Product Water:
    • 0 ppm TDS
    • Conductivity <0.1uS/cm
    • Resistivity approx. 18 MO
  • Product to Waste Ratio: 1:2
  • Physical Dimensions:
    • RO Unit: 15" L x 6" D x 17" H;
  • Total Weight: Approx. 27 lbs
  • Operation Temperature: 40-104°F / Maximum temperature 40°C.
  • System Operating Pressure: 45-75PSI.
Lower than 45 PSI you must add a booster pump + high-pressure shut-off switch.
Higher than 75 PSI Add pressure control valve to fix the pressure @60-65PSI.

Warning: This system should only be used with a biologically safe water supply.

Filter cartridges should be changed every 6-12 months under domestic conditions. Filter life varies and depends on the water source quality.

‡ Total Dissolved Solids

5 Stars
We purchased this 5 stage 75 gpd reef aquarium r/o system. The entire system has run flawlessly. The resulting filtered water is purer (lower tds) and produces more than our previous "on demand" Merlin r/o system. We also purchased the low & high pressure switches as well as a booster pump. We are very pleased with the equipment as well as the timely fashion in which everything was delivered. Thank you Maxwaterflow ! Sincerely Richard
Reviewed by:  from Lanark Ontario Canada. on 12/24/2010
5 Stars
Aquarium RODI
Great product, great price! Have had mine installed for three years now with no issues. I didn't buy the pressure tank with the package initially but added it shortly after. I HIGHLY recommended purchasing the pressure tank with the RODI system. Very satisfied with the product quality, pricing and ease of getting and replacing the filter elements. The float has worked flawlessly for the entire time as well. Don't even bother searching for a better deal, it's right here!
Reviewed by:  from USA. on 9/3/2016

Filters/Parts for Item Number:101044

Spun Polypropylene Sediment Filter 1 Micron, size 10
12.00  8.00
Part Number: 104001
In Stock
GAC UDF Carbon Filter for Reverse Osmosis & Whole House Systems
Average Rating(1)
Part Number: 104004
In Stock
CTO Carbon Block Filter  5 Micron 10
Average Rating(1)
Part Number: 104005
In Stock
Water Filter Set (CTO Carbon Block + UDF GAC + 1M Sediment Filter) Size 10
Average Rating(2)
47.00  45.00
Part Number: 104515
In Stock
Mixed Bed Ion Exchange DI Resin for RO Aquarium  - 2 Lbs
Average Rating(2)
45.00  42.00
Part Number: 104138-2
In Stock
75 GPD Reverse Osmosis Membrane
Average Rating(2)
Part Number: 104093
Out of stock

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