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It runs very strong once it starts so I don't think the motor. However the o ring you refer to has always been problematic so I think I will order a replacement just to try.
In any case thank you for the quick reply and suggestion.
I have a Rena Filstar xP 1 and Xp2. They are both over 5 years old.
I live in an area that has regular less than a second power failures.
Both filters run fine once they are going but when this power failure happens the Filstar 1 just restarts and keeps running. The Filstar 2 always stops and...