Most pool filters are fitted with a pressure gauge mounted on top of the filter.  Sometimes the gauge is mounted on the multiport valve.  These gauges read 0 to 60 psi and are useful in several ways.  When the pressure goes beyond 10 pounds over the normal operating pressure, it is time to clean the filter.


The pressure gauges spot the operating problems in the system. If the pressure is lower than normal, it indicates that there is obstruction in the water that is coming into the filter. When the pressure reads high, then the filter is dirty or there is some obstruction in the flow of water after the filter. When the pressure fluctuates while the swimming pool pump is operating, the pool or the spa might be low in water or have some obstruction at the skimmer.  It is for these reasons that pressure gauge is an important instrument on the filter.


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