High & Low Pool Filter PSI
PSI is: Pounds per square inch a standard unit for measuring pressure and the most common factor used in determining when to backwash or clean a pool filter. A filter pressure gauge is used to measure a filter's PSI and every filter should be equipped with one. The most obvious reason for high PSI is that the filter is dirty. Simply cleaning the filter or backwashing it if you have a D.E. Or Sand Filter will usually lower the PSI down to an acceptable range. The clean starting filter PSI will vary from filter to filter, some hover around 10-15 PSI but many cartridge filters start at 20 PSI. The best way to know in your case is to clean the filter and then mark on the gauge the clean PSI for your particular filter. A general rule of thumb is that if the PSI goes up by 10, if it is at 15 and goes up to 25, then a cleaning or backwashing is due. This is the best way to lower high filter pressure and get the pool circulating again. After cleaning the filter or backwashing it the...