i have an above ground pump that's a sears 20/40 PSI, and lately it's been losing pressure. everytime the culprit ends up being the pressure switch where rust from the pump clogs up the line and the elbow. i keep cleaning it out and it works fine for another couple of months, and i have to repeat the process. do i need a new pump to solve this, since this one is almost 20 years old?
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