Reverse Osmosis

Direct Flow


5 Stage Filtration

Quick Change Filters

1+ L/min

Your Key Benefits

Being in a class of its own, Expert MOD600 is a high end water purification system that offers multiple advantages

Cleanest Water

R.O. treated water is free from chlorine, heavy metals, other dissolved solids and ions, bacteria and viruses, and even microplastics.

Beyond Bottled Water

The system delivers virtually unlimited amount of safe, clean and delicious water right at your sink, every day.

Take water off your grocery list!

Modern Innovative Technology

• Direct flow R.O. filtration in real time, no storage tank required
• Fully automatic operation
• Compact and modular

Fresh Flux

High, instantly available and sustained water flow and distinct freshness of water filtered in real time.

Never wait for a tank refill.

No more stale water from a tank.

Unbeaten Efficiency

Up to three times less water waste per gallon of filtered water due to 1:1 or better recovery rate.

Save on your every utility bill!

Lower Cost of Ownership

High efficiency rate leads to a less frequent filter change necessity.

The more you use your R.O. machine the more you save on maintenance!

This direct flow reverse osmosis water filtration system saves tons of water wasted per year and solves maintenance and water quality issues with tank based systems.

Read on and discover how you can carry out high level purification without such an economic and environmental impact.
The future of reverse osmosis is tankless.

About R.O. Filtration

Reverse osmosis is currently the most advanced yet natural method of water purification. Semipermeable membrane allows only water to pass through and rejects everything else.

R.O. treated water is free from chlorine, heavy metals, other dissolved solids and ions, bacteria and viruses. This water is safe and refreshing, requires no boiling and is a good choice for all kind of use including newborn baby feeding.

Make no mistake, this osmosis process is as much natural as it can be since it’s essentially the same as the one in every living cell on Earth. Cell membrane allows only what it needs to get through and rejects everything foreign.

These days the human genius reproduced this natural process in a highly sophisticated nanotechnology device right at your sink.

No magic, no unproven claims – just pure science! Reverse osmosis is used everywhere when real clean water is needed, not claims: from pharmaceutical production to space station water supply, from multi-million population area municipal water desalination plants to marine ship rescue kits.

Beyond Bottled Water Quality

  • Expert MOD600 tankless reverse osmosis system delivers virtually unlimited amount of safe, clean and joy inducing water right at your home, every day.
  • No need to transport and dispose of bottled water any more!
  • Great for drinking, ice makers, beverages, coffee & tea, food preparation & cooking, sports, etc.
  • This R.O. system removes odor and most harmful substances such as heavy metal ions and total dissolved solids from tap water making it tasty, fresh and vital. It delivers a pure, refreshing experience with no aftertaste of heavy metals, limescale or chlorine.

How It Works

The system usually mounts under the kitchen sink with the purified water faucet been installed on the sink or deck. An available on the market combo tap with built-in waterway for filtered water can also be used.

To get fresh and clean water instantly just open the faucet, and everything else will be performed automatically.

Main Features

Proprietary water purification machine designed from ground up for best water quality, ease of use and low maintenance costs

Clean and safe drinking water right at your sink. No need to transport and dispose of bottled water any more.

Factory-preinstalled filters and membrane for faster and easier setup.

Compact and beautiful design.

Fully automatic operation:

  • just open the faucet and get clean water instantly;
  • automatic shut off and flush.

Powerful booster pump increases the inlet pressure to radically improve the R.O. process effectiveness.

Guaranteed performance even in low water pressure environments.

Automatic flush prevents the scale and debris buildup on the membrane outer surface: for peak performance and healthier membrane.

Idling protection: if you forget to turn off the pure water faucet and leave it on, say, overnight the pump bot will shut down the system automatically for you.

LED indicators: easily understand what the state of your R.O. machine is.

No mess, quick and easy filter change: for easy regular maintenance.

Quick fittings everywhere for easy tube connections.

Designer faucet included.

Advanced Prio® Pump Bot included.

A Game Changer:

Water Saving Machine with the Most Effective, 1:1 or better recovery

Direct flow scheme, high pressure reverse osmosis and high production membrane allowed to achieve the enormous reduction in the amount of water going down the drain during filtration.

Cut your expenses on utility bills and save planet Earth's water resources! Savings may become so significant that this reason alone may be a game changer for whole cities, not to say a single household.

Conventional R.O. units with a tank use a lot of water because they have low pressure and low production membrane. As a result, they recover only 5 to 20% of the water entering the system. The remainder is discharged as waste water.

For example, a conventional reverse osmosis system delivering 5 gallons (19 L) of treated water per day may discharge between 20 and 90 gallons (75–340 L) of waste water per day. This is having disastrous consequence for mega cities like Delhi where large-scale use of household R.O. devices has increased the total water demand of the already water parched National Capital Territory of India.

On the contrary, Expert MOD600 direct flow reverse osmosis system reaches 1:1 or even better recovery rate meaning that only 5 gallons or even less of waste water will go down the drain in the example above. This is 4 to 18 times less in precious water resources waste and associated costs.

Like New Every Day!

Unlike multi-stage in-line filters with cartridges the reverse osmosis system does not absorb and keep dirts inside. The membrane separates clean water from dissolved solids and other rejected particles that go down the drain.

Thus, R.O. system is “like new” every day! It remains clean and delivers safe purified water without the risk of its secondary contamination.

Encapsulated Reverse Osmosis Membrane Element Inside (Drawing)

If you’re still using bottled water for drinking today, you’ll be making a smart investment that saves you money in the long run and is better for the environment.
Get better than bottled water quality without the bottle!

Already Got a Whole House Water Softener?

Then you may have excessive sodium in your water after the whole house system. Ion exchange resin treated water while good for your pipes and home appliances is not necessarily good for your body. It is not considered the one of food grade quality and may lead to hypertension and other medical concerns when taken regularly.

Use Expert MOD600 point-of-use water filtration system to remove excessive Na+ ions from your softened water making it safe and vital again.

Zero Noise Operation Option

You may optionally install the main filtration unit and the Pump Bot up to 50 feet apart. This ensures a zero noise operation of the system in your kitchen. You also get more free space for all your kitchen essentials under the sink. In fact, as it's tankless as well, this powerful R.O. system becomes even more compact.

Also don't forget about convenient filter change as the main filtration unit doesn't contain electrical components or wires. This makes the maintenance easy and safe. And you even don't always need an electrical outlet under the sink either.

5 Stage Filtration System

  • 5-micron sediment poly block pre-filter to filter suspended particles such as dirt, sand, rust, etc.
  • Carbon block to reduce free chlorine, chloramines, chlorine taste and odor.
  • High-production 450gpd R.O. membrane element to reduce dissolved solids, metal ions, bacteria and viruses, and other suspended particles as small as 0.0001 micron.
  • Two-stage water conditioning combo post-filter.

5 μm Sediment Poly Block Pre-Filter K871


5 μm Sediment Poly Block Pre-Filter

Effective reduction of:

  • rust, dirts, sand and sediment
  • other contaminants*
Coconut Carbon Block Pre-Filter K870


Coconut Carbon Block Pre-Filter

Effective reduction of:

  • dirts, sand and sediment
  • taste and odor, including chlorine taste and odor
  • other contaminants*
High-Production (450gpd) R.O. Membrane Element K858


High-Production (450gpd) R.O. Membrane Element

Effective reduction of:

  • suspended solids
  • dissolved ions
  • bacteria and viruses
  • other contaminants*
Coconut Carbon Block and Remineralization Water Conditioning Post-Filter K880


Coconut Carbon Block and Remineralization Water Conditioning Post-Filter

  • improves taste and removes odor, remineralizes water*

Set Includes:

  • Advanced Booster Pump Box Unit with Auto-Flush
  • Multi-Stage Filtration Unit with High-Production R.O. Membrane
  • Designer Faucet
  • Installation Kit

What Makes It Special

Have a reason: R.O. machine that's perfectly engineered, environmentally, user friendly and remarkably effective and useful

Direct flow system for instantly available, high and sustained flow of filtered water.

Waste water saving — saves tons of waste water a year as compared to conventional systems.

High production membrane element (450gpd) to further minimize the cost of ownership.

Inlet water lack protection.

True R.O. high rejection rate membrane of genuine Toray sheet made in Japan.

Safe, quick and easy filter change due to separation of all electrical components from the user serviceable filtration unit.

A number of optional post-filters available: with carbon, with re-mineralization, with alkalization, with catalytic natural anti-bacterial schungite mineral for water conditioning and taste improvement.

Suitable for commercial applications (small restaurants, hotels, etc.).

Low noise.

Encapsulated Membrane Element

Get a Second Pure Water Line Option for Free

An extra union tee fitting is included in the set that can be used to get a second line of clean water going to the other point-of-use (such as a sink in a bathroom or ice maker in a fridge).

World’s First Filtration Split System

This filtration system consists of two units: the innovative digital control unit with LED indicators, auto-flush and powerful booster pump, and the R.O. filtration unit with high-production R.O. membrane and filters.

Together, they provide direct flow capability of water filtration in real time, eliminating the need of a water tank usually found on conventional systems, flexible installation, safety and ease of maintenance.

Direct Flow Reverse Osmosis Benefits

Thanks to high production membrane and powerful pump this system doesn't require a storage tank. It's capable of producing on-demand the strong pure water flow in real time. Also, you enjoy better purification and less water pouring down the drain.

Freshness of water filtered in real time. No more stale water from a tank.

Tankless: space-saving, compact installation since tank is not needed.

Free up undersink space for all your kitchen cleaning supplies!

Better water purification quality due to improved contaminant rejection rate.

R.O. membrane works best when under high pressure.

Saves you money and Planet Earth’s water resources!

Typically, up to three times less water is wasted per gallon of filtered water, compared to the traditional tank systems. This is due to the much higher efficiency rate.

Virtually unlimited filtered water production.

While conventional systems with tanks are limited by the tank capacity, and require prolonged timeouts to refill the tank, a direct flow system is limited by the membrane filtration rate only.

Instant and sustained filtered water flow. It doesn’t depend on how full the tank is.

It also makes commercial application possible too.

Lower cost of ownership due to prolonged service life of pre-filters and membrane, what is in turn a result of higher efficiency rate: less water is treated overall by pre-filters and the membrane for each gallon of permeate produced.

This saves the capacity of pre-filters and ensures either less frequent change necessity or better purification.

Less number of components leads to better reliability and easier servicing.


Innovative electronically controlled unit ensures fully automatic operation: just open and close the faucet and everything else will be performed automatically. Get your filtered water instantly anytime.

Ultra Low Waste per 1 Gallon of Filtered Water

Expert MOD600 direct flow R.O. system saves you tons of waste water a year due to high efficiency rate. Refer to the detailed comparison below to see how this system saves money on your utility bill.

Values below are given per 1 gallon of purified water*.


Tank R.O. System,
No Pump

Tank R.O. System,
with Pump

Tank R.O. System,
with Pump,
with Auto-Flush

Prio® Expert MOD600
Direct Flow, Tankless,
R.O. System


Membrane Production Rating





higher is better

Permeate Flow1, ml/min





higher is better

Flow Restrictor, ml/min






Instant Recovery Rate





higher is better

Time to Recover 1 G, min





lower is better

Autoflush Time, s






Flush Flow, ml/min






Drain During Recovery, G





lower is better

Drain During Auto-Flush, G






Total Drain, G





lower is better

Drain To Permeate Ratio
as Compared to That of Expert MOD600





lower is better

Efficiency Rate1





higher is better

Rejection Rate2, typical





higher is better

1 For a conventional system with a tank the permeate flow is not constant and decreases gradually due to increasing back-pressure from an air-pressurized tank during each tank refill cycle. Actual efficiency rate for these systems often is even worse than indicated here. For direct flow system permeate flow is steady.

2 For a conventional system, especially w/o pump, the rejection rate can be particularly worse than indicated here due to the use of LP or ULP membranes optimized for low inlet pressure environments and back pressure from a tank by sacrificing the rejection rate performance. In contrast, the Expert MOD600 system uses the true no-compromise R.O. high rejection rate membrane because it’s equipped with the powerful high-pressure pump and doesn’t suffer from a tank back pressure.

* See the manual for conditions of use, important safety information and detailed installation instructions before use. All data apply to normal household use. Actual performance may vary.

Users' Testimonials

Amazingly useful.

Megan Lambert, New York, NY

I have an emotional investment in the product. It’s important for people and the environment. Plastic bottles must go.

Anthony Roberts, Birmingham, UK

Truly, the system has a good production of approx. 80 lt/hour and has a very low drain.

Andrea Gagliardi, Rome, IT

Install in Five Easy Steps

Expert MOD600 is easy to set up using basic tools and included accessories.

1 Position the System.
This system naturally mounts under the kitchen sink but also can be installed near other points-of-use: in a cellar, garage or utility room. The unique feature of the system is a possible “split-installation”: install the pump box unit up to 50 feet away from the R.O. unit itself. You may place both units under your kitchen sink, or you may place the R.O. filtration unit under the kitchen sink near the faucet, and the pump box unit in a bathroom near the electrical outlet, cold water supply and drain pipes.

2 Install Adapter Ball Valve to Feed Water to the System.

3 Install the Filtered Water Faucet.
It can be installed in an existing hole of soap dispenser or water sprayer, or in a new hole in the sink or deck. An available on the market combo tap with built-in waterway for filtered water can also be used.

4 Install Drain Saddle on the Drain Pipe.

5 Connect the Tubes and Start Up.
All internal tubes are already factory pre-installed. You only need to connect few external tubes, such as water supply, faucet and drain tubes by following the enclosed chart.
Then turn on the system, make quick initial washing and start enjoying safe, clean and tasty water.

Connection Chart

Expert MOD600 Connection Chart

Tip: Expert MOD600 R.O. System may also be used with an optional tank if you prefer! Storage tank can be added easily, at any time, even after installation of the system itself.

Related Products

What's in the Box

(1) The auto-flush booster pump box unit

(1) The R.O. filtration unit

(1) Adapter ball valve (user configurable to ⅜” x ⅜” x ¼”, ½” x ½” x ¼” or ½” x ⅜” x ¼”)

(1) Teflon tape roll

(1) Faucet (depending on SKU and market)

(1) Drain saddle

(1) Wrench

(26 ft / 8 m) Water tubing ¼”

(1) ¼” x ¼” union check valve

(1) ¼” x ¼” x ¼” union tee fitting or Y-fitting

User’s guide

Expert MOD600 Front Photo
Expert MOD600 Package Contents

Technical Data

Operating requirements:

  • Minimum supply water pressure: 7.25 psi (0.05 MPa)
  • Maximum supply water pressure: 80 psi (0.55 MPa)
  • Minimum water temperature: 41 °F (5 °C)
  • Optimal water temperature: 59–77 °F (15–25 °C)
  • Maximum water temperature: 95 °F (35 °C) / up to 105 °F (40.5 °C) short-term
  • Ambient air temperature: 41–105 °F (5–40.5 °C)
  • Water source: tap water supply, chlorinated or non-chlorinated, bacteriologically safe
  • Supply water pH range: 4.0-11.0
  • Supply water turbidity: < 1 NTU
  • Supply water components: Hardness (CaCO3) <180 mg/L ( <10.5 gpg), Iron <0.1 mg/L, Manganese <0.05 mg/L, Hydrogen Sulfide 0.00 mg/L
  • Maximum supply water TDS: 1000 ppm
  • Indoor use only
  • Electrical input: AC 100-240V 50/60 Hz
  • Electrical plug: US Type A / Europlug CEE 7/16
  • Maximum length of the line between the pump unit and the membrane (“split installation”): 50 ft (15 m) (purchase of extra tubing may be required)
  • Tubing: ¼”


Performance of the appliance such as filtered water delivery rate, rejection rate, etc. is highly dependent on local conditions (inlet water pressure, temperature, TDS and degree of contamination, etc.) and R.O. system use pattern. Actual performance may vary.

  • Filtered water production rating: 450 gpd (1650 lpd) maximum
  • Filtered water delivery rate, nominal: 0.159–0.370 gpm (0.6–1.40 l/min), typical: 0.238–0.327 gpm (0.9–1.25 l/min)
  • Membrane rejection rate1, typical: ≥90%
  • Recovery rate (system efficiency2), typical: ≥50%
  • Drain water flow restrictor: 300 cc (ml/min) nominal, up to 450 cc in working mode, open flow in flush mode.
  • Auto-flush duration: 18±5% s
  • Idling protection: 120 minutes
  • Power consumption: ≤60 W (working mode), ≤40 W (flush mode), ≤2 W (standby mode)

Weight and size:

Pump box unit:

  • Size (WDH), body only, excluding protrusions: 8.74 x 4.80 x 12.44” (222 x 122 x 316 mm)
  • Weight, without water and tubing: 8.6 lbs (3.9 kg)

R.O. filtration unit:

  • Size (WDH), body only, excluding protrusions: 13.46 x 4.92 x 14.80” (342 x 125 x 376 mm)
  • Weight, without water and tubing: 8.8 lbs (4.0 kg)

Shipping Weight: 20 lbs (9.5 kg)


Fully CE certified and conforms to Directives and Standards 98/83/EC, 2006/42/EC, 2014/30/EU, 2014/35/EU, (EU) 2015/1787, EN 14652:2005+A1:2007, EN 13443-2:2005+A1:2007, EN 14898:2006+A1:2007, etc.


1 year limited warranty (+ local regulations if applicable)

1 For all dissolved solids combined as measured by TDS or conductivity meter.

2 Efficiency rating means the percentage of the influent water to the system that is available to the user as reverse osmosis treated water under operating conditions that approximate typical daily usage.


Get more information on Expert MOD600 system in downloadable PDF documents

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