Posted by K Effective on July 09, 2020 at 20:50:22 from (99.184.108.123):
In Reply to: Hot tank solution posted by 37 chief on July 09, 2020 at 10:05:23:
We use sodium hydroxide to clean the membranes of a reverse osmosis water filtration system at work. The cleaning tank is about 900 gallons, usually filled to 70% or so with hot water. Our new system uses an eductor to suck the caustic out of a 55 gallon barrel as it mixes the tank, so an exact measurement of chemical added is not as easy. About two gallons of 50% caustic soda will result in a pH above 12 for the 600 gallons of cleaning water plus whatever residual water is in the filter housings. At 12+, it will blister skin in minutes.
For comparison, i added about five liters of hydrochloric acid 36% to the same level of fresh water in the tank later on, and it took pH down under 2.That acid comes in 2.5L glass jugs, so measurement is much more accurate.
I have recently seen guys making citric acid slurry in a kiddy pool to strip paint/bondo from auto body panels, etc. I think it would be less dangerous to the human body than caustic soda or other acids.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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