How to Backwash a Pentair FNS Plus 60 Pool Filter

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Maintain clear water by backwashing the Pentair filter when needed.

Pentair offers a wide range of pool products including their line of pool filters. The Pentair FNS Plus 60 pool filter is a popular choice among pool owners as it offers ease of use and maintenance. As the filter becomes dirty and clogged, the pressure will begin to rise in the filter. Once the pressure rises 7-10 PSI above its normal pressure, it’s time to backwash the filter. Backwashing is an easy process of cleaning the filter without disassembling the unit. Backwash the filter when needed to ensure the pool water stays clean and clear.


Step 1

Turn the pool pump off. Locate the multiport rotary valve. The valve is found on the lower right side of the filter. Turn the multiport valve to the “backwash” setting.

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Step 2

Turn the high flow manual air relief valve a quarter turn counter clockwise. This will open the high flow manual air relief valve into full open position. This will release air that is trapped in the filter decreasing the filter pressure.


Step 3

Turn the pool pump on. Once a steady steam of water is exiting the filter waste line, close the air relief valve. Allow the water to flow until it is clear. Shut the pump off.

Step 4

Turn the multiport valve to the “closed” setting. Prime the filter by adding the required amount of filter media. The filter is now ready for use.

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