Mark C Sinking Spring , PA May 06, 2018 Circulation pump stopped working Your video was a big help, thank you. I took the unit apart to find what I would need, a new grinding wheel and blade, etc. Decided to just replace the whole unit, rather than just the pump and smaller parts. Made it much easier. Took me about 1/2 hour to change it out. My pump had been making loud noises for about 2 months, I figured it was only a matter of time. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes