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This post was last edited by hesonchang214 on 2020-3-24 at 10:31. 1. Clogging of the check valve: Sometimes the check valve can also become clogged. Although this happens rarely, we can remove the check valve during inspections to check the water flow rate. If there is a noticeable change in the water flow after it is removed compared to before, then it means it is indeed blocked. 2. Faulty transformer If the transformer is faulty, it is unable to provide the voltage required for the pump to generate proper pressure; as a result, the rotation speed is low and the pressure generated is low. With such low pressure, it is not possible to achieve the pressure needed for tap water to pass through the RO membrane, and therefore the water production rate is slow. After ruling out the main factors that cause slow water production, such as issues with the pump or the membrane, it is necessary to try using a new transformer. 3. Clogged filter element One of the most common faults in equipment is a clogged filter element. Now, secondary pollution of tap water is becoming increasingly serious; if pipe repairs are carried out as well, the filter elements will surely get clogged. In these residential areas, due to the lack of dedicated maintenance, filter elements are rarely replaced, so clogging is a common occurrence. Replacing the filter element is extremely important for extending the lifespan of the equipment. 4. Membrane clogging: Failing to replace or clean the pre-filter elements over time results in water quality inside the machine being much worse than that of the water before it enters the machine. The poor quality of the raw water, combined with a low proportion of wastewater, leads to blockages in the wastewater solenoid valves or flush combination valves. As a result, no wastewater is discharged, or only very little wastewater is released, which in turn causes blockages in the membranes and reduces their service life. 5. Low pump pressure increase and loss of pump pressure. A low pump pressure increase generally occurs in devices that have been in use for more than two years, or in devices that are operating continuously for long periods of time. Loss of pressure in the pump is generally not easy to detect. The direct manifestation is less water output from the membrane or no water output at all, which is often mistaken for a clogged membrane.