Water Purification

Water Purification

Every laboratory requires purified water. Every application requires a specific grade of purified water. 

Determining which ‘grade’, ‘quality’, ‘type’ or ‘technology’ your laboratory needs, is not always easy. Here at Avidity Science, we are proud to have a team of experts available to guide you to the right solution; we have a system or can design a combination, for your bespoke requirements.

Our EMEA based branch is proud to design and manufacture water purification systems in the UK to the exacting ISO9001:2015 standard. With a long established expertise in water purification and a global presence, Avidity Science offers a competitive range with unbeatable quality and reliability. Use our helpful product finder below to find the pure water system that matches your requirements.

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What is the Relevance of Water Purification?

Reagent quality is critical to the accuracy and repeatability of results. Ultimately the success of laboratory or clinical endeavours depends on the quality, accessibility and reliability of the pure water supply.


Water Purification Technologies

In order to produce pure water suitable for use in scientific applications, water must pass through a series of technologies which remove impurities. Various laboratory applications require the removal of different impurities and therefore a range of technologies are utilised. 

Pre-treatment

Filtration - Depth filters are commonly used as pre-treatment. Raw water passes through a series of wound fibres and carbon, which bind and trap impurities. This offers protection to the RO membrane and other purification technologies that follow.

Reverse Osmosis (RO)

This is the most economical method of removing up to 98% of feed water inorganic contaminants and >99% of organics, bacteria and particulates. During natural osmosis, water flows from a less concentrated solution through a semi-permeable membrane to a more concentrated solution until concentration and pressure on both sides of the membrane are equal. In water purification, external pressure is applied to the more concentrated side of the membrane to reverse the natural osmotic flow. This forces the feed water through the semi-permeable membrane to produce permeate. The impurities are deposited on the membrane surface and flushed to drain as concentrate.

Reverse Osmosis & Deionisation (DI) / Ion Exchange

This process removes ions from water, usually RO water, with the use of synthetic cation and anion resins. The ions are removed from the water through a series of chemical reactions. These reactions occur as the water passes through the ion exchange resin beads. Gradually, all unwanted ions are exchanged for hydrogen and hydroxyl ions which combine to form pure water.

Ultraviolet (UV) Photo Oxidation at 254nm & 185nm

Photochemical oxidation and UV light eliminate trace organics and inactive microorganisms in feed water. The 254nm light reacts with bacterial DNA resulting in denaturation. The 185nm light breaks down long chain organics which can then be removed from the water by ion exchange.

Deionisation & Ultrafiltration (UF)

Ultrafiltration is used to remove pyrogens (bacterial endotoxins) and nucleases. Ultrafilters use size exclusion to remove particles and macromolecules. Typically, an ultrafilter is deployed at the end of the process to ensure near total removal of such impurities.


Water Purification Technologies

Water Quality Diagram

Lab Water Types and Applications


Guides, Videos and Case Studies

Use the resources below to learn more about our range of Water Purification Systems