Replacement interval for filter elements in small-scale deionized water systems
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1. The quality of the effluent water is poor, with a significant increase in the conductivity of pure water. 2. When the reading on the water inlet pressure gauge differs significantly from the pressure of the tap water, and it remains below that pressure for several consecutive days. 3. When the water discharge flow rate decreases significantly. 4. The outer surface of the filter element is covered with sludge and impurities, or the color of the filter element has changed significantly.
When the quality of the water entering the system is poor, it is generally recommended to use multi-stage filtration: rust and visible sediment must be filtered out by a pre-filter, in order to prevent the membrane used for reverse osmosis from being contaminated and its lifespan from being reduced. After all, such membranes are quite expensive, and it is necessary to carry out automated backwashing of these membranes. If the pressure difference increases and the water output decreases significantly, it indicates that the membrane needs to be replaced.