When it starts making noise. With a tooth brush.
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you are supposed to clean your pump?
I usually use my electric tooth brush that sure gets the job done.
I too use soft toothbrushAND, what do you use to clean your teeth?
I'm talking about the saw teeth on your overflow....
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About the sameI just use a toothbrush about 2 times a month. Usually when I notice the level in my sump start to change
On my 66, only when I notice the the water level creeping up towards the top of the rim.
On my 240, maybe once per year.