• Direct-Q® Water Purification System

Direct-Q® Water Purification System

  • Brand: MERCK
  • Catalogue number: MER-ZRQSVP300A
  • Availability: In Stock


Direct-Q® systems deliver both RO (Type 3) and ultrapure (Type 1) water directly from tap.

With the Direct-Q® range of water purification systems, you benefit from a choice of ultrapure water configurations. All systems produce Type 1 water (18.2 MΩ•cm at 25 °C ultrapure water) on demand from the RO stage, the first step in the purification chain. Depending on daily volume needs, different RO production flow rates are available (3, 5 & 8 L/h). Type 3 water is easily available from the 6L built-in storage tank, or the external 30/60 L storage tanks for the higher flow rates, or can be sent by a distribution pump to feed instruments such as a glassware washing machine.

For applications sensitive to organic contaminants and requiring ultrapure water, a UV version of the Direct-Q® system is also available. It incorporates a dual wavelength UV lamp for photooxidation of organic compounds. A final purification step at the point-of-dispense removes specific contaminants critical for your experiments. A range of purification cartridges and Application-Paks is available for you to select according to your requirements.

Simple handling & maintenance

  • Easy installation anywhere in your laboratory with its compact design and optional remote dispenser. Either wall-mounted, on or under the bench, choose the setup that is most convenient for your daily work. 
  • Dispensing adapted to different size laboratory glassware at an instant flow rate of 0.5 L/min. 
  • Save time thanks to the volumetric function. It will automatically deliver the water volume that you requested. 
  • Easily insert your pack in one movement with the patented locking mechanism.

Quality certificates

For full confidence in your Direct-Q® system, it is delivered with a Certificate of Conformity ensuring that it has been built and tested fully assembled following internal Standard Operating Procedures. All Direct-Q® consumables are delivered with their Certificate of Quality. The manufacturing site is ISO® 9001 v.2000 and ISO® 140001 certified.


Water Specifications

Direct-Q® ultrapure water (Type 1)

Resistivity at 25 °C18.2 MΩ•cm
TOC (Direct-Q®)≤ 10 ppb
TOC (Direct-Q® UV)≤ 5 ppb
Particulates (size > 0.22 µm)**<1 Particulate/mL
Bacteria**< 0.1 CFU/mL
Pyrogens*** (endotoxins)< 0.001 EU/mL
RNases***< 0.01 ng/mL
DNases***< 4 pg/µL
Flow rate (with Application-Pak final filter)> 0.5 L/min
* In the appropriate test conditions
** With Millipak® final filter
***With Biopak® Polisher
These values are typical and may vary depending on the nature and concentration of contaminants in the feed water.

Direct-Q® RO water (Type 3)

Ionic rejection> 96%
Organic rejection for MW > 200 Dalton> 99%
Particulates rejection> 99%
Production Flow Rate at 15 °C +/- 15 %3 L/h (Direct-Q® 3)
5 L/h (Direct-Q® 5)
8 L/h (Direct-Q® 8)

Feed water

Feed Water QualityPotable tap water
Feed water connection½” Gaz M
Feed water pressure0.5 - 6 bar

System Specifications

Dimensions (H x W x D)540 x 290 x 380 mm (21.3 x 11.4 x 15 in)
Operating weight (Direct-Q® 3)17.6 kg (38.8 lb)
Operating weight (Direct-Q 3 UV)18.2 kg (40.1 lb)
Operating weight (Direct-Q® 5, 8)12.2 kg (26.8 lb)
Operating weight Remote Dispenser2.68 kg (5.91lb)
Built-in Storage Tank volume (Direct-Q® 3)6 L
Electrical power supply voltage100 - 250 V +/- 10%
Electrical power supply frequency50 - 60 Hz +/- 10%


The Direct-Q® system is tested by an independent and accredited company for compliance with the CE directives related to safety and electromagnetic compatibility. The report can be consulted on demand. The Direct-Q® system is built using components and practices recommended by UL and has been cUL marked. The registration can be verified on the UL web site ( http://www.ul.com).