Laboratory and Medical Grade Water


Laboratory and medical grade water, also known as ultrapure water, can be divided based on individual applications and on the standard(s) it must meet. There are several standards-setting organizations and while there are similarities among their pure water specifications, they may differ in parameters such as silica, TOC, bacterial plate count, endotoxins, resistivity and others. Typical standards include:

  1. USP - The USP designation means that the water is the subject of an official monograph in the current US PHARMACOPEIA with various specifications for each type. The quality of water carrying a USP designation can vary from the lowest purity specification "USP Purified" typically required by the FDA for manufacture of oral and topical pharmaceuticals and the highest purity, USP Water for Injection (WFI), used in injectible pharmaceuticals
  2. CLSI - The Clinical and Laboratory Standards Institute addresses preparation and testing of reagent grade water used in clinical laboratories. CLSI has replaced water standards previously issued by NCCLS: National Committee for Clinical Laboratory Standards. The categories of purity include:
    1. CLRW - clinical laboratory reagent water
    2. SRW - special reagent water
    3. Instrument and feedwater
    4. Autoclave and wash water
    5. Water supplied by a method manufacturer
    6. Commercially bottled; purified water
    7. These designations replaced the long-used Type I, II and III designations. CLRW can typically substitute for Type II and III water and autoclave and wash water purity for Type III.
  3. ASTM International - formerly known as American Society for Testing and Materials, ASTM has standards for laboratory water which designate Type I, II and III quality. These standards typically apply more to non-clinical laboratory settings.
  4. CAP - College of American Pathologists. This organization works closely with CSLI in setting standards for validation and operation of laboratory equipment.


Typical uses for laboratory and medical grade water:
  1. Highest purity – this is typically required for HPLC,GC, HPLC ,AA , ICP-MS, for buffers and culture media for mammalian cell culture & IVF and for reagents for molecular biology.
  2. “Mid purity” – Water for buffers, pH solutions, culture media preparation , clinical analyzers.
  3. Lower purity – Water for glassware rinsing, filling autoclaves, heating baths and humidifiers.

Services and Equipment Offered by the WaterProfessionals®:
  1. Products:
    1. Sales and rental (we own, we maintain) of high purity water treatment systems capable of meeting all levels of purity required for your specific applications, such as lab water. Pretreatment (sediment filters, activated carbon), reverse osmosis, exchange deionization, disposable deionization cartridges, submicron filters, hydrophobic submicron tank vent filters, ultra-filters, pumps, blending valves, storage tanks, level controls, polishing filters, ultraviolet sterilizers, ultraviolet TOC destruct
    2. Counter or wall mount ultrapure polishing units designed to use potable water or deionized water as feedwater.
  2. Services:
    1. Installation, start up and training in use of all types of water treatment systems.
    2. Service agreements, ranging from quarterly or semi-annual visits to turnkey maintenance on all types of water treatment systems.
    3. Pipe / loop sanitization.
    4. LAL testing for endotoxins
    5. Design and installation of high purity loops

For More Information, Contact Us

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