InVorTex®—U.S. Patent 8.382.980

Zero Noise

4 Stage Filtration

Quick Change Filters

2 L/min

Going ahead of time, we have created a perfect and advanced product

Expert M400 U.F. Purifier

Prio® Expert product line of undersink water filters shifts the boundaries of the possible. None of the past generation systems can be compared to them, both in technical parameters and water purification quality, which has moved closer to ideal like never before.

Beyond Bottled Water Quality

  • Expert M400 ultrafiltration 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 multi-stage filtration system removes most harmful substances such as free chlorine, chloramines, chlorine taste and odors from tap water making it tasty, fresh and vital.
  • It also stops most of cysts, bacteria, protists and viruses and even purifies water from microplastics and pollen.
Make Your Contribution to Saving Our Planet

Make Your Contribution to Saving Our Planet

Save your pocket as well as our Planet: cut your costs dramatically by switching from bottled water to an in-house water purifier and reduce environmental impact of water bottles’ carbon footprint and plastics in the landfills.

Modern Design, Space-saving Dimensions

Thin, light and space-saving, with urban cutting-edge design, Expert M400 sets a new standard of what water filters must look like in the 21st century.

Slim Space Saving Design

Four Stage Filtration System

Removes mud, sand, sediment and most harmful substances such as heavy metals, chlorine, microplastics, pollen, protists and other contaminants*, improves water taste and odor.

5 μm Sediment Poly Block Pre-Filter


5 μm Sediment Poly Block Pre-Filter

Effective reduction of:

  • rust, dirts, sand and sediment
  • other contaminants*
Coconut Granular Activated Carbon Filter


Coconut Granular Activated Carbon Filter

Effective reduction of:

  • taste and odor, including chlorine taste and odor
  • other contaminants*
Coconut Carbon Block Filter


Coconut Carbon Block Filter

Effective reduction of:

  • dirts, sand and sediment
  • taste and odor, including chlorine taste and odor
  • other contaminants*
Ultrafiltration Membrane Element


Ultrafiltration Membrane Element

Effective reduction of:

  • suspended solids
  • taste and odor
  • most of bacteria and viruses
  • other contaminants*

* See the manual for conditions of use, important safety information and detailed installation instructions before use.

Expert M400 Is for You

High-quality multi-stage filtration, quick-change filters, compact and modern slim design, U.S. patented; installation kit, worldwide tee-adapter valve and premium designer faucet are included — this is the most useful and beautiful, and simply the best, undersink water filter we have ever created.

Expert M400 Undersink Ultrafiltration Purifier

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!

Related Products

What's in the Box

(1) Multi-stage filtration unit with installed filters

(1) Universal worldwide adapter ball valve (G1/2” - G3/8” - UNEF 9/16”-24 - JG 1/4”)

(1) Teflon tape roll

(1) Faucet

(1) Wrench

(13 ft/ 4 m) Water tubing ¼”

User’s guide

Technical Data

Operating Requirements:

  • Minimum supply water pressure: 20 psi (0.14 MPa).
  • Maximum supply water pressure: 116 psi (0.8 MPa).
  • Minimum water temperature: 41ºF (5ºC).
  • Optimal water temperature: 59-77 ºF (15-25ºC).
  • Maximum water temperature: 95ºF (35ºC) / up to 105ºF (40.5ºC) short-term.
  • Ambient air temperature: 41–105ºF (5-40.5ºC).
  • Water source: tap water supply, chlorinated or non-chlorinated, bacteriologically safe.
  • Supply water pH range: 4.0-11.0.
  • Supply water turbidity: < 1 NTU.
  • Recommended filtered water production rate: 34-68 fl oz/min. (1-2 l/min.).
  • Indoor use only.
  • Tubing: ¼”.

Weight and Size:

  • Size (WDH), excluding protrusions: 13.46 x 3.35 x 14.80” (342 x 85 x 376 mm)
  • Weight, without water and tubing: 7.5 lbs (3.4 kg)


Fully CE certified and conforms to Directives and Standards (EU) 2015/1787, 98/83/EC, EN13443-2:2005+A1:2007, EN14898:2006+A1:2007, EN14652:2005+A1:2007, etc.


1 year limited warranty (+ local regulations if applicable)


Get more information on Expert M400 system in downloadable PDF documents

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