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DIW - De-ionised Water 5ltr
Deionised water is not the same as distilled water, although they are both forms of purified water. While the deionisation process produces high purity water by removing mineral ions it will not significantly remove any uncharged organic molecules. Whereas the distillation process boils water and then condenses the vapor which leaves both solid, mineral contaminants and organic contaminants behind.
Normal tap water is full of ions derived from the natural environment, the pipes and other sources. Typically these might include Sodium (Na), Calcium (Ca), Iron (Fe) and Copper (Cu). The deionisation process removes these mineral ions and is an important aspect of water purification for various applications.
WHAT CAN DE-IONISED WATER BE USED FOR…..
Deionised water is used in various applications which require water of high purity. Here are some examples.
Chemistry and Laboratory Applications
Water of known purity is often required in chemistry and laboratory applications. Accurate test results can only be obtained when the purity of the water used in experiments is reliably known. Adequately pure water is also needed for cleaning lab equipment and sterilisation.
Water purity levels are are classified from Type I to Type IV, where Type I is defined as ‘ultrapure’. Water purity is assessed using various characteristics including:
- Resistivity
- Conductivity
- TOC (total organic compounds) for Type I water.
Industrial Processes
Various industries make widespread use of pure, deionised water. They include chemical processing, petrochemicals, pharmaceuticals, power, food and beverage industries along with micro-electronics.
Cooling Applications
Regular tap water contains varying levels of dissolved contaminants, including minerals. These contribute to the electrical conductivity of the water which makes it unsuitable for many cooling applications. These dissolved minerals will also contribute to the build up of scale, corrosion and erosion. Deionised water is therefore preferred in these applications as it has a far lower level of electrical conductivity and will not result in unwanted scale build up.
The design of cooling systems require special consideration in order to minimise or avoid any downtime. Such systems require tight control and continuous monitoring of the deionised cooling water conductivity to ensure that required temperatures are maintained.
Boiler Feed
Boiler feedwater is the water that is pumped into the boiler steam drum where it is turned into vapor. If this water contains significant dissolved minerals then there will be a build up of scale in the steam drum.
The quality of the boiler feedwater is clearly important as it affects boiler performance, scale build up and corrosion. Deionised water is typically used as this helps to minimise these issues and prolong boiler life.
Extinguishing Fires
The low electrical conductivity of deionised water makes it safer to use in fire extinguishing applications for electrical equipment.
Aquariums
Regular tap water is not ideal for most aquariums as the impurities promote the growth of algae. Deionised water is often preferred for its purity which helps to improve the overall health of aquatic life.
Automotive
Deionised water is commonly used in engine cooling systems as the low level of mineral content means there is minimal scale build up, thus prolonging the life of the system. It is also often used to top up lead-acid batteries. Also used for washing and rinsing surface prior to paint finish, to improve adhesion and improve surface finish.
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