Quick Answer
Replace your pump filter cartridge when flow rate significantly decreases, or when the manufacturer-specified replacement interval is reached, typically every 6-12 months, depending on usage.
Monitoring Flow Rate
The most common indicator of a clogged or worn-out filter is a decrease in flow rate. Check the manufacturer’s specifications for the expected flow rate, and compare it to your current reading. A drop of more than 20% in flow rate may indicate the need for a replacement. Use a pressure gauge to measure the pressure difference before and after the filter to determine the flow rate.
Replacement Interval
Check the manufacturer’s guidelines for the recommended replacement interval, which is usually every 6-12 months. However, this can vary depending on usage. If your pump operates continuously or is used for heavy-duty applications, you may need to replace the filter more frequently, every 3-6 months. Conversely, if your pump is used infrequently, you may be able to stretch the replacement interval to 12-18 months.
Visual Inspection
In addition to monitoring flow rate and replacement interval, visually inspect the filter cartridge for signs of wear or damage. Check for any visible blockages, tears, or mineral buildup on the filter surface. If you notice any of these signs, it’s likely time to replace the filter, even if the replacement interval has not been reached yet.
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