Everytime. 90 force (pos) I flush for a few minutes till the water tastes fresh coming out. Then I usually cut off the water and let it run out so its not sitting up in the water pump. Extreme changes in water temp can crack the plastic impeller. That's why I pump it dry. Motor is a 97 model. If had it 10 years and changed pump once and it wasn't broken when I changed it.
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