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I have an 1" and two 1/2" flow sensor. All three have demonstrated a somewhat peculiar behavior. The apparent flow rate will go from a relatively high number to zero and stay there. E.g. my 1" sensor will go from 160 GHP to zero in a second. The flow is not actually zero as I can tell. The smaller ones do the same. Do they have to be cleaned often? I am not sure what is going on.
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