An in-line deioniser, an optional addition to some units, is a water treatment system used in process cooling equipment to remove impurities like minerals, salts, and other dissolved solids from the water supply. The in-line deioniser operates using a resin bed that consists of both cation and anion exchange resin beads. The cation exchange resin beads attract and capture negatively charged ions like calcium and magnesium, while the anion exchange resin beads attract positively charged ions like chloride and sulphate. This dual-resin system effectively purifies the water, making it suitable for use in process cooling.

The effectiveness of an in-line deioniser, however, diminishes over time as the resin beads become saturated with ions. Regular regeneration or replacement of the resin bed is necessary to maintain the system’s performance. An in-line deioniser is particularly beneficial in situations where high-purity water is essential, such as in semiconductor manufacturing or pharmaceutical production. It’s also advantageous in areas with hard water of poor water quality, as it can prevent scaling and other issues by purifying the water supply before it enters the chiller.

Using an in-line deioniser brings several benefits, including improved performance and efficiency of cooling equipment by removing detrimental impurities. This leada to reduced maintenance and downtime, and prolongs equipment lifespan. It ensures a consistent supply of high-quality water, crucial for applications requiring precise temperature control. On the downside, in-line deionisers have significant initial costs, limited lifespan of resin beds, and maintenance requirements. They may not suit high-flow applications and can cause galvanic corrosion, especially in systems containing copper, accelerated at high temperatures and water speeds. Despite these drawbacks, an in-line deioniser remains a valuable addition for specific applications where water purity is paramount for cooling system performance.