Isopure Water (ISO-RO4DI) 4 Stage Reef-Aquarium Deionized Reverse Osmosis Water Filter System 75 GPD

Isopure Water (ISO-RO4DI) 4 Stage Reef-Aquarium Deionized Reverse Osmosis Water Filter System 75 GPD

  • $159.99
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About Our 4 Stage Reef-Aquarium Deionized Reverse Osmosis Water Filter System

Our RO/DI units are for Reef/Aquarium enthusiasts who require only the purest of water and when reverse osmosis is not enough. Reverse osmosis removes a large majority of TDS (total dissolved solids) but not enough of it. TDS is can be lowered to extremely low levels by using a DI (deionization) filter. With our systems, you will typically get ZERO to near ZERO TDS readings!!!

  • Easy to install
  • Affordable replacement filters
  • Great tasting water


  • Dimensions: 16" height x 16" width" x 5.5" depth
  • Unit Weight: 15 Lbs.

Recommended Potable Water Supply Condition:

  • Max. Total Dissolved Solids (TDS) : <2,000 ppm
  • Water Pressure Range : 40-100psi (2.8 bar) required
  • Min. Inlet Water Pressure : 40 psi (2.8 bar) required
  • Water Temperature Range : 40-85°F (4.5-30°C)
  • Water pH Range : 4-11


Isopure Water's Reverse Osmosis/De-Ionizing System is designed to be conveniently moved from one location to another. Weighing at less than 20 pounds, you can hook it up, obtain the amount of water you need and store it out of the way for later use.

99.9% Contaminants Removal/Reduction

The RO does most of the work removing up to 97% of contaminants. A DI filter is used as a polishing filter to finish the work by removing the remaining making it 99.9% effective in removing unwanted substances commonly found in tap water. The TDS (total dissolved solids) are reported to drop to ZERO or near ZERO TDS LEVELS.

How It Works

Reverse Osmosis: First, you would need to know what a normal osmosis is. According to the Merriam-Webster Dictionary, Osmosis the natural process which occurs when water flows from a purer solution through a semi permeable membrane into a more concentrated solution. Reverse Osmosis, on the other hand is a mechanical process that uses water pressure to force concentrated solutions, water, to flow to a more purified water source.


DI stands for deionization or demineralization. DI filtration is used when there is a need for ultra-pure water or non-electrical current water. DI resin contains a mixture of beads that are positively and negatively charged. These beads attach themselves to any charged ion and then release hydrogen ions or hydroxide ions in return. The product water is then considered deionized. It is best to use these DI filters as a post filter to reverse osmosis to maximize the life of the DI resin.

How Substances Are Separated by a Membrane

Reverse Osmosis/De-Ionizing uses a semi-permeable membrane that allows fluid that is being purified pass through while it rejects the remaining contaminants down the drain. It is always a 1:4 ratio. For every 1 gallon product water, there is 4 gallons of waste water.

1st Stage : Sediment Depth Filter
Part Number: 1227867-V (5 Micron)
(Polypropylene Melt-blown Depth Filter)


  1. Dimension: 2.5" Dia. x 10"
  2. Max. Flow : 1.0 GPM
  3. Max. Pressure : 125 psi
  4. Max. Temperature : 125°F (52°C)
  5. Service Life : 5,000 gallons


  • 100% Polypropylene NSF Certified Material
  • Particle Removal (dirt, sediment, rust particles, and other particulates)
  • Improving Water Clarity, Taste, and Odor
  • Greater Dirt-holding Capacity with Multi-layers Gradient Design
  • High Flow Rate, Low Pressure Drop
2nd Stage : Coconut Shell Carbon Block Filter
Part Number: HQCBC-10-5 (5 Micron)


  • Dimensions: 2.5" Dia. x 9.75"
  • Max. Flow: 1.0 GPM
  • Max. Pressure: 125 psi
  • Max. Temperature: 125°F (52°C)
  • Service Life: 2,500 Gallons


  • 100% Coconut Base Carbon NSF Certified Material
  • Chlorine, Odor and Bad Taste Removal
  • High Adsorptive Capacity and Efficiency
  • Great Removing Volatile Organic Carbon Compounds (insecticides and/or pesticies)
  • No Channeling
  • No Release of Carbon Fines
  • High Flow Rate, Low Pressure Drop
3rd Stage: RO Membrane Filter
Part Number : TW30-1812-75 (75 gallons per day)


  • Dimension: 1.75" Dia x 11.74"
  • Up to a 98% Rejection Rate*
  • Polyamide Thin-Film Composite
  • Max. Pressure: 150 psig
  • Max. Temperature: 113° (45°C)
  • Max. Feed Flow Rate: 2 GPM
  • Max. Feed Silt Density Index (SDI) : 5
  • pH Range: 2-11
  • Service Life: 2-3 years


  • Reduce TDS value in water
  • Reduce 98% of dissolved minerals, salts and other chemical contaminates in potable water supply*
  • Remove most harmful chemicals
  • Reduce E.coli in potable water
  • Remove most heavy metals
  • Reduce TDS, Barium, Cadium, Hexavalen & Trivalent Chromium, Copper, Lead, Radium 226/228, Selenium, Fluoride, Nitrite, Nitrate (see owner manual for more details)
4th Stage : Mixed Bed DI Filter
Part Number : 1025DIC


  • Dimension: 2.75" Dia x 9.75"
  • Polyamide Thin-Film Composite
  • Max. Pressure: 125 psig
  • Max. Temperature: 125° (52°C)
  • Max. Flow Rate: 1 GPM
  • pH Range: 2-11
  • Service Life: 5,000 ppm


  • Reduce TDS value in water
  • Reduce 99.9% of dissolved minerals and salts
  • Removes Nitrates, Phosphates, Silica, Ammonia, and other charged contaminants


  • High Rejection Filmtec 75 GPD membrane:
    • One of the highest quality membranes available for RO/DI systems.
  • Pre-Assembled
    • The system is already put together so all you have to do is hook it up and you are good to go.
  • Color Coded Tubing
    • Makes set up so much easier than it already is!
  • Flow Restrictor
    • Controls waste water amount, supplying the right amount of pressure against the membrane to maintain its effectiveness. This feature also allows the system to have an extended life.
  • Check Valve
    • This feature reduces waste water by preventing pressure from pushing water through the membrane and down the drain.
  • Clear Housings
    • Easy way to monitor your system and its filters. With clear housings, you are able to tell when the filters need to be changed.
  • Mounting Bracket
    • This will allow you to increase your installation process
  • 1/2" NPT Feed Valve Adapter
  • Drain valve
  • Please note : System does not include faucet or Storage Tank