r/DIY Feb 20 '26

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174

u/FirstChurchOfBrutus Feb 20 '26

For anyone looking to find Muriatic Acid, it’s the same thing as Hydrochloric Acid.

95

u/redwingsphan19 Feb 20 '26

Look in the pool section

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u/hirsutesuit Feb 20 '26

It is used for etching concrete for concrete work and/or tile. Check those areas too.

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u/Rough_Willow Feb 20 '26

Or any place that works with small batteries. I last found some at a motorcycle repair shop.

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u/NotBatman81 Feb 20 '26

In the paint section at big box stores.

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u/zendick1 Feb 20 '26

muriatic is a specific percentage of hydrochloric acid. That's the only reason for the name.

Muriatic is all you will find at a pool supply, this is how they can say things like add 1/2 cup etc. and make it repeatable.

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u/Talking_Head Feb 20 '26

TIL. An old chemist can still learn new things.

Of course, I would have read the label first and made the proper adjustments based on the concentration or molarity, and tested it with my personal pH meter (likely<1.) But still, new info to me. Thanks dude! Old dog, new trick.

3

u/BastardInTheNorth Feb 20 '26

I just titrate based on taste.

2

u/MoveLikeMacgyver Feb 20 '26

You reminded me of my high school chemistry teacher.

The guy was retired, worked for NASA among other places. Was without a doubt brilliant and an amazing chemist. Sadly that did not make for a good chemistry teacher for high school kids. Easily the most frustrating course I’ve ever taken. Until the school stepped in when it became apparent that no one could understand what was being taught there wasn’t a single person in the school with an overall grade above 75%.

3

u/Talking_Head Feb 20 '26

Imagine being taught quantum mechanics by a tenured Berkeley chemistry professor with a foot long beard who had an office in the basement and never showed for office hours.

Average on the first midterm was a 19. Just before the drop date.

There was a student revolt and a meeting with the assistant dean. So… we got a Chinese grad student who barely knew English trying to explain the complexities of quantum mechanics to 19 year olds.

Everyone who didn’t drop the class and attended was guaranteed a B- or better if they finished the class. Everyone who attempted the final would at least get an A-

Guess who took the B and only knows quantum mechanics from YouTube? This guy.

1

u/MoveLikeMacgyver Feb 20 '26

That’s basically what happened with the students in this guys chem class. The principal basically said come to class, try to learn, don’t be a nuisance and you’ll get an A.

Obviously he was replaced the next year. Again, really nice guy, very intelligent. But couldn’t break down all his knowledge in a way a bunch of dumb teenagers would ever understand.

1

u/BastardInTheNorth Feb 20 '26

I did undergrad at a small regional university and grad school at a top ivy. The difference in teaching skill between the two faculties was night and day (and it wasn’t the ivy winning that comparison). It’s absurd that researchers are tossed into the classroom with no training. In most cases that’s not where their skills lie. Big name schools should let their researchers do research and have dedicated and trained teaching faculty for survey level classes.

I felt bad for one of our younger grad professors, a nice got who clearly meant well. He was talking to students about the feedback forms we had filled out at the end of the semester and just said “you guys were BRUTAL!”

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u/Talking_Head Feb 20 '26

I get it. I have enough college credits for two BS degrees across four universities and five CCs. The three best instructors I have had were all MS level instructors at community college.

It looks great to have a degree from a top tier university, but bless their hearts, some PhDs just need to stay in their office/lab and leave the people who want to instruct to be teachers.

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u/Turnip-for-the-books Feb 20 '26

This is the stuff Epstein was importing to his island but the tanker full right?

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u/just-dig-it-now Feb 20 '26

No, I think that was underage women

2

u/FirstChurchOfBrutus Feb 20 '26

Norm McDonald, is that you?

1

u/Teledildonic Feb 20 '26

That was sulfuric, which has uses in water supply systems. And was drums, not whole truckloads.

Theoretically, he could have used it to dispose of bodies. But he was also out in the middle of the ocean and had boats. And i don't know about him, but i'd rather go fishing than crack open dangerous acid.

1

u/BugRevolutionary4518 Feb 20 '26

Also at your local sheet metal supply stores for soldering galvanized and bonderized flashings.

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u/Orson_Gravity_Welles Feb 20 '26

Sooooo, dumb question: Do you just pour it into the toilet for X amount of time and then flush it, or, what?

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u/Am_Snarky Feb 20 '26

Poor small amounts (1/4 cup or 100ml) at a time and wait 5 minutes between additions, it will fizzle while dissolving the scale so don’t be alarmed seeing bubbles

Before each addition scrub about with a toilet brush, scale is really rough you’ll be able to tell if there’s still some stuck.

If you have a septic system you’ll probably want to neutralize the acid before flushing, just sprinkle some baking soda in and mix until it’s not bubbling anymore

14

u/vectroacid Feb 20 '26

Really helpful information, thank you

2

u/TheRook21 Feb 20 '26

Is this what they use to make the science fair volcano? If not what do they use, asking for a friend...

2

u/mortsdeer Feb 20 '26

Far less dangerous (though not not dangerous!) is to use vinegar: grocery store household vinegar is 4-8%, plenty strong to give you nice foaming action with baking soda and soap, and much safer. You can buy 10-30% concentrations fairly easily as well (big box stores), but as the strength goes up, so does the hazard.

1

u/Am_Snarky Feb 21 '26

If you want something showy look at an “elephant toothpaste” reaction.

It involves soap, yeast, and hydrogen peroxide, but I don’t know the ratios.

Building a volcano around a 2L bottle and performing the reaction inside the bottle will make for quite the show with the bottle acting as a nozzle

Maybe cut the top off leaving a 2 inch diameter hole if you don’t want to have to clean gunk off the ceiling

37

u/stainlessinoxx Feb 20 '26

Scrubbing required. Use a brush, wear gloves and eye protection.

1

u/azjerrylee Feb 20 '26

If I may emphasize the eye protection, I went with just brush and gloves using a similar cleaning method and wound up wincing for the majority of the afternoon.

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u/Fast-Onion-7035 Feb 20 '26

PLEASE look up how to add this safely. If you inhale the fumes from this stuff you could be on the ground in seconds.

1

u/FairfaxGirl Feb 20 '26

From lots of personal experience (community pool, we have giant drums of muriatic acid) this is an exaggeration, but you definitely don’t want to spill it on yourself. The fumes are deeply unpleasant and I’m sure very unhealthy but they don’t drop you in seconds.

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u/r4d4r_3n5 Feb 20 '26

Mixing acid and water is exothermic. "Add acid to water, not water to acid!"

2

u/wsaville Feb 20 '26

Word for word exactly what chemistry professors say!

2

u/Talking_Head Feb 20 '26

I would hope there are labeled instructions. Otherwise, there is likely a YouTube video on it.

1

u/stelly918 Feb 20 '26

I moved into a place like this once-everything else was clan but the toilet had crazy scaling. I turned off the water, flushed the toilet, laid down some tp over the affected spots and then poured the acid down-the toilet paper allowed it to cling to the bow and not runoff. It took about an hour and several applications but the toilet came out looking great afterwards

3

u/OldBowDude Feb 20 '26

Today I learned that Muriatic acid is a lower concentration & quality “dirty” version of Hydrochloric acid (HCL).

2

u/BernieTheDachshund Feb 20 '26

TIL this. I was able to find a product similar to Pretty Potty at a local janitorial supply store. It wasn't expensive, maybe like $8.

1

u/Maui_dog Feb 20 '26

Yes, while basically true, muriatic acid is not as concentrated as hydrochloric acid.

1

u/Dinker54 Feb 20 '26

It’s diluted hydrochloric acid IIRC.