Cascada™ BIO- and AN-Water Systems: Multi-Stage Monitoring

The Cascada BIO- and AN-water Systems feature a unique double purification cartridge pack and monitoring system that provides key benefits to the user:

• Guaranteed product water quality
• No breakthrough of organics, silicon or boron
• Insusceptibility to monitoring errors
• Increased security
• Capacity gains

As shown in Figure 1, the Cascada BIO- and AN-water Systems incorporate two purification cartridge packs, each containing deionization resins and other media; and two water quality sensors, one to measure the quality (as resistivity) of the water after the first pack (R1), and the other at the end of the purification sequence (R2) just prior to the point of use.

Figure 1
Twin Purification Cartridge Packs - Principle of Operation

Typical resistivity values at these two points, as the unit is used, are shown in Figure 2. As the deionization capacity of the first purification pack starts to exhaust, after approximately 930 liters of water have been used, the intermediate resistivity at R1 starts to fall from its initial value of 18.2 Mohm-cm. However, the resistivity of the product water at R2 is still maintained at 18.2 Mohm-cm by the purification cartridge pack in the polishing position.

When the resistivity at R1 has fallen to 1 Mohm-cm (after 1580 liters in this example), the primary purification cartridge is removed and discarded. It is replaced by the polishing cartridge and a new pack is fitted in the polishing position. This process can be repeated indefinitely. In this way, a highly regenerated unused pack is always present in the polishing position.

Figure 2
Intermediate and Product Water Resistivities Feed: Sodium Chloride, 37 µS/cm, 1.8 L/min

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