I should have taken pictures of the citric acid bath. Not sure why I didn't but I noticed Paul Pratt gets way too excited at this point as well to remember to document every step.
I bought a $22 mini fountain pump from Home Depot and ten feet of plastic tubing. I rolled the tubing and put it in a big stock pot full of water on the stove. I put all the pieces I was cleaning into a small cooler with the citric acid bath mix. The pump and the end of the hose went into the bath. The pictures below are from the TSP bath and for this I used a plastic bucket.
I found the cooler kept the solution at 120+ for many hours even without the solution heater system going. As for the acid bath the pump worked great even at 135 degrees. The instructions say not to exceed 87 on the pump but it worked well. I used a thermometer to monitor the temperature of the solution and was able to maintain stable temperatures with the stove on low for many hours. I used the foil to protect the hose from possibly melting on the hot edge of the pot. The lids in the water held the tubing off the bottom of the pot and kept them submerged.
I think the moving solution helped get things clean as well.
There are always more elegant methods to do most things but this was cheap and leaves me money to replace machine parts. This was at the end of the bath process so the stock pot looks like it could use more water.
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