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This how we recommend to check and see if you need to back wash and or clean you Pentair FNS 60 De filter when you have a flow meter installed. FNS® Plus Vertical Grid D.E. Filter Owner's Manual Your filter requires one of the following Pentair Pool Position valve to BACKWASH setting. 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” *PENTAIR IS A REGISTERED TRADEMARK OF PENTAIR AQUATIC SYSTEMS FNS Plus, Nautilus, Nautilus Plus. BACKWASH: To backwash filter, turn off pump.