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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