Innovating science for over 130 years

Request a Quote Form

Yamato Auto Still WG205 Small Capacity Water Purification System

WG205-115V  WG205-220V


Yamato’s Auto Still WG205 is an economical multi-purpose benchtop high purity water purification system with 20L tank capacity. It is equipped with a pre-treatment cartridge to increase the life span of all consumables.  In addition, it displays alerts for consumable replacements and keeps track of replacement history. The WG205 produces ASTM type 1 deionized water and type 2 distilled water kept in a 20L storage tank.


  • Pre-treatment cartridge removes bacteria, trihalomethane, residual chlorine, organic and dust
  • High performance ion-exchange resin cartridge (CPC-S, 4L) brings high purity water with low electric conductivity and TOC
  • Optional membrane filter at water sampling port
  • Displays replacement of consumables
  • Equipped with automatic bolier drainage function
  • Compact. Can be installed in areas with limited space.
Water purifying methodIon-exchange→Distillation
Purified waterDeionized water and distilled water
Distilled water production *¹~1.5L/h
Distilled water delivery rate *²~1.5L/min
Deionized water delivery rate *¹~1.0L/min
Range of production *¹ Continuous production
CondenserHard glass
HeaterCeramic heater 1.2kW
Pre-treatment cartridge0.1µm diameter hollow fiber + activated carbon
Ion-exchange resin cartridgeCPC-S 4L x 1pc. (activated carbon high-purity cartridge)
Final filtrationOptional membrane filter
Leakage indicationWater supply solenoid valve forcibly shut off when water leakage detected
Distilled water tank capacity20L polyethylene tank
Multi-purpose distilled water sampling portRight side of main unit, 1pc.
Water level sensorFloat switch 2-stage detection
Raw water pressure range0.5~5 MPa
Power source (50/60 Hz)AC115V 11A with external transformer
AC220V 6A with external transformer
External dimension*W540 x D575 x H775 mm
Water level displayCommunication pipe water level indication
Water quality display5 steps conductivity LED indication
Other displayReplacement of consumable parts (ion- exchange resin cartridge)
Included accessoriesWater supply hose (2m), water supply hose filter, connection hose assembly, can scale cleaner, pretreatment cartridge, ion exchange resin cartridge

*1 Performance data above is based on 23°C ±5°C room temperature, and 65% RH ±20% humidity.
Operating ambient temperature range for this unit is between 5°C and 35°C. Keep temperature range of raw water between 5°C-30°C. When raw water temperature is high, the drainage temperarture may also be high.
*2 The guaranteed performance range is raw water pressure 0.2 -0.5 MPa. Water dispensing volume varies dpending on water temperature.
*3 Dimensions excludes protrusions.


Click on the links below to download the associated PDFs.

WG205 Catalog

Water Purification Systems Buyer’s Guide

To download Operational Manual, visit our Technical Support Center

Lab Water Purifiers

Solutions are sensitive to contaminants, so any imbalance in the mixture invalidates the results of your experiment. Impure water contains contaminants that pose risks. As a result, water should undergo a purification process to reach a certain level of purity. Our lab water purifiers here at Yamato can help you produce ASTM Type 1, Type 2, and Type 3 water quality. Besides that, our lab water purifiers can help you with the following applications:

Buffers and reagents

A buffer corrects the pH level of any solution. On the other hand, a reagent stimulates a reaction to detect the absence or presence of other substances. Both solutions are prepared by dissolving solid reagents in pure water that are free from any substances that affect the acidity or pH level of the solutions.

Since water is a major solvent involved in creating these solutions, a deionized water system for laboratories is necessary to produce water with high levels of purity. The Yamato Auto Pure WA300 series water purifiers can remove dissolved minerals through high-purity ion exchange resins to process high-quality pure water, which is ideal for preparing both solutions.

Cell culture

Normal water contains compounds that affect cell culture which includes bacteria, endotoxin, organic ions, and organic compounds. These contaminants can cause chemical reactions, changes in pH levels, and disrupt or kill various cells.

Moreover, water is also used in producing buffers and rinsing bioreactors and other materials. Therefore, producing laboratory grade water is necessary. This is usually achieved using Yamato Auto Pure WB300 series water purifiers. These units are great in removing bacteria and particulates to reach type 1 water quality, the highest level of purity in water.

Reverse osmosis

In order to make Type 1 or Type 2 water, feed water quality is important. Reverse osmosis is used as pretreatment of raw water just before feeding it to water purifiers which can produce Type1 or Type 2 water.


Traditional method of producing purified water is distillation, which is the process of separating liquid mixtures through condensation. Academia and certain applications require the heat treated distilled water. Yamato Auto Still series water purifiers can produce distilled water.

40 years as a leading scientific lab equipment provider in the United States.
All products come with a 1 year warranty.
Every product is made through environmentally conscious methods and remains eco-friendly all throughout its life cycle.