High Swimming Pool Filter PSI Solved!

PSI is Pounds per square inch, a standard unit for measuring pressure and the most common factor in determining when to backwash or clean a pool filter. A filter pressure gauge calculates a filter's PSI and every filter should be equipped with one.

The most apparent reason for high PSI is that the filter is dirty. Simply cleaning or backwashing the filter if you have a D.E. Or Sand Filter will usually lower the PSI 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. In your case, the best way to know is to clean the filter and then mark the clean PSI for your particular filter on the gauge.

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 filter pressure should drop. If it goes back up within a day or week, there could be a few reasons for this. First, the grids or cartridges are worn out and must be replaced. If you have a Sand Filter, the sand could be really dirty, and you must clean or replace it. Also, if the pool was recently green or cloudy, the filter could fill up quickly with organic matter. Cleaning the filter again usually will solve the issue. If the D.E. Filter grids have a tear or the top manifold is cracked, the filter pressure can rise rapidly after cleaning.

If you have a Return Side cleaner connected to your pool, like a Polaris 360, the PSI may rise while it is associated due to the back pressure created by closing off a return line and by the cleaner connection itself. This is normal and nothing to be concerned about. The pressure may also be higher by as much as 10 PSI when you switch the valves to spa mode. The back pressure created by the spa jets will cause the filter pressure to rise. A water feature may also cause the filter PSI to rise.

So these are the reasons why your pool filter pressure will rise.

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