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  • Update Date：2025-01-15
  • Units：Instrumentation Resource Center
[YangMing] Type III & Type I Water System: ELGA PURELAB Option/Ultra
ELGA PURELAB Option/Ultra Secondary/tertiary pure water system
  • Lab-grade Water System (Type III Water)
    Reagent-grade Water System (Type I Water)
  • Brand/Model:
    • ELGA PURELAB Option
    • ELGA PURELAB Ultra
  • Instrument Location: Yang-Ming Campus
    • Room349, 3rd Floor, Biomedical Engineering Building (G machine)
    • Room B04, B1 Floor, Shou-ren Building (F machine)
  • Term of use: Please read the instructions and usage rules
    • Free of charge for on-campus use; please contact the center staff for off-campus use.
    • No reservation required
  • Contact center staff：
Type III water (Primary Grade)
  1. Purification process: reverse osmosis (RO) treatment.
  2. Suitable for general experiments and washing containers.
  3. Model: PURELAB Option
Type I water (Ultrapure)
  1. Purification process: reverse osmosis + deionization (Milli-Q).
  2. Suitable for HPLC, biochemical analysis, DNA, Protein, cell culture, chemical microanalysis, reagent preparation, and sample dilution.
  3. Model: PURELAB Ultra
  4. ※Type III water is not resistant to overnight storage. Please take an appropriate amount.
Explain 3 types of different water
  • Please do not leave the site when fetching water, as it may overflow.
  • Since the type I and type III water is precious and the type I water (ultrapure water) is expensive to regenerate, the amount of water for each fetch is limited.
    • For each fetch, the maximum amount of type III water (RO) you can take is 20L; for type I water (ultrapure), it's 10L. Please adhere to these limits to ensure the proper usage and preservation of our ultrapure water resources.
    • Please take enough for the day (do not fetch too much and store it, or the quality will become worse and a waste! Please cherish the resources).
  • Precautions for direct water intake from the machine:
    1. Directly taking water from the machine's water intake will significantly decrease the automatic water intake (ATM) flow. If someone is using the ATM before you, please follow the first come, first serve principle. Kindly wait for the one using the ATM to be finished, and then you can use direct water intake from the machine.
    2. If you need to take water from the direct water intake urgently, please first orally consult the one using the ATM water withdrawn to agree.
  • Type III water  (RO) operation instructions
  • Type I water (Ultrapure) operation instructions
  • The Principle of water purification system 1
  • The Principle of water purification system 2
ELGA VEOLIA
About the pH value of ultrapure water
  1. Ultrapure water has a very low conductivity due to the absence of H+ and OH– ions. As a result, conductivity (inorganics value) is used to measure its quality rather than pH value. Suppose the conductivity of ultrapure water is around 0.055 μS.cm-1, Inorganics value 18.2 MΩ.cm (resistivity at 25°C), which means there are almost no other ions in it, and it's safe to use in experiments.
  2. Ultrapure water quickly forms carbonic acid due to the dissolution of carbon dioxide in the air, resulting in a decrease in pH value (the impedance of ultrapure water may drop from 18.2 to 4 MΩ.cm in an hour due to the dissociation of carbonic acid, and the pH will drop to about 4~5.) It is recommended to take it fresh before use.
References : How to Measure the pH of Ultrapure Water
Instrument List of YM Campus Merck Millipore pure water system
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