How to Safely Get Rid of Leftover Muriatic Acid

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Protect your home, yourself, and the ecosystem by following these muriatic acid guidelines
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If you have leftover muriatic acid, it's important to get rid of it in a way that won't harm your plumbing, yourself, or the environment. While this strong cleaning product is useful for removing stains and scale buildup from brick, tile, and concrete, it’s also highly corrosive and dangerous. This article covers 3 step-by-step methods for disposing of it safely and responsibly, plus 6 helpful suggestions for using up leftover muriatic acid.

Things You Should Know

  • Dilute muriatic acid by pouring ¼ cup (59.15 mL) into 2 gallons (7.6 L) of water; then pour it down the drain if city regulations allow it.
  • Neutralize 1 gallon (3.8 L) of acid by mixing in 5.5 pounds (2.49 kg) of baking soda, then pour it down the drain.
  • Use leftover muriatic acid to clean brick, concrete, toilets, and tile. Or, use it to balance your pool’s pH.
  • Give leftover muriatic acid to a local hazardous waste facility; they will dispose of it for you. Don't pour muriatic acid outside or down a storm drain.
Section 1 of 6:

Can I pour muriatic acid outside or down a drain?

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    Doing so would kill plants and harm the soil, and the acid could leach into groundwater. Dumping muriatic acid down a storm drain harms the ecosystem because this untreated water feeds into local rivers and streams. It's illegal to dispose of hazardous waste this way. [1]
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Section 2 of 6:

Diluting Muriatic Acid

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    Make sure the bucket is made of HDPE, LDPE, or PTFE plastic (muriatic acid will melt ABS and PP plastic). [2]
    • To determine the plastic type , flip over your bucket and check the bottom. It will likely have the abbreviation below the recycle symbol.
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    This includes safety goggles, acid-resistant gloves , a long-sleeved shirt, and long pants. Wear a respirator and/or work in a well-ventilated area. [3]
    • Muriatic acid is very corrosive and will burn your skin. The fumes can cause respiratory irritation. Always wear the proper safety gear while using muriatic acid.
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    Always add acid to water; never add water to acid. If you get it backward, an explosive exothermic reaction will occur! [4]
    • Pouring undiluted muriatic acid down the drain can ruin your pipes.
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    Flush the solution out of your pipes by running the water for several minutes. [5]
    • Review your city's wastewater regulations to make sure they don't prohibit disposing of diluted muriatic acid in this way. Search for “waste management,” “sewer,” or “wastewater” on your city’s website for more information. [6]
    • Don’t use this method if you have a private septic tank, as it destroys helpful bacteria. Only use it if you’re connected to the city’s sewage system. [7]
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Section 3 of 6:

Neutralizing Muriatic Acid

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    This equals about 5 ½ cups (1.21 kg) of baking soda per 3.5 gallons (13 L) of water. Do this in a large, acid-resistant bucket and stir with a wooden stick.
    • Only use a bucket made of HDPE, LDPE, or PTFE plastic. ABS and PP plastics can’t hold corrosive acids. [8]
    • Identify the plastic type of your container by examining the bottom for the abbreviation above the recycling symbol.
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    Goggles, acid-resistant gloves , a long-sleeved shirt, and long pants will protect you from splashes. Put on a respirator and/or work in a well-ventilated area. [9]
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    Wait about 5 minutes for the solution to stop fizzing. Then, add another cup (220.8 g) of baking soda. If it fizzes, wait for it to stop, then add additional baking soda. [10]
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    Once the fizzing stops, the solution is neutralized. [11]
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    If you use a city sewer system, the neutralized mixture is safe to pour down the drain. [12] Don’t use this method if you have a private septic tank, as it destroys helpful bacteria. [13]
    • Only use this method to get rid small amounts of muriatic acid, as it requires about 5.5 pounds (2.49 kg) of baking soda for every 1 gallon (3.8 L) of acid. [14]
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Section 4 of 6:

Using Up Leftover Muriatic Acid

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    Put on your safety gear, then fill an acid-resistant bucket with 10 parts water before adding 1 part muriatic acid. Apply the solution to the brick and allow it to sit for a few minutes before scrubbing with a stiff nylon brush . Then rinse the surface with a 1:16 solution of ammonia to water. [15]
    • Appropriate safety gear includes goggles, acid-resistant gloves , a long-sleeved shirt, and long pants. [16]
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    If the water has too much chlorine, you can lower the pH with muriatic acid. Put on your safety gear, then follow the instructions on the container to determine how much to add. Slowly pour it over a running return jet, then test the pH after 4 hours.
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    Start by rinsing off the concrete with a hose. Put on your safety gear, then create a 15:1 mixture of water to muriatic acid in an acid-resistant bucket . Apply to the stain using a sturdy scrub brush, then rinse the concrete using a pressure washer or hose. [18]
    • Protect yourself from splashes by wearing goggles, acid-resistant gloves , a long-sleeved shirt, and long pants. [19]
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    Fill an acid-resistant bucket with 10 parts water, then carefully add 1 part muriatic acid while wearing the appropriate safety gear. [20] Pour ½ cup (118.29 mL) into the toilet bowl, then allow it to sit for up to 3 hours. Scrub with a toilet brush and flush.
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    Put on protective gear and pour 1 gallon (3.8 liters) of water into an acid-resistant watering can , then add 1 gallon (3.8 liters) of water. Wet the pool walls with a hose, then pour the acid solution on a 10-foot wide (3.05 m) section at a time. After 30 seconds, scrub with a brush. [22] Acid-washing your pool removes stubborn scale buildup.
    • Proper protective gear includes goggles, acid-resistant gloves , a long-sleeved shirt, and long pants. [23]
    • Use this method on a swimming pool with concrete walls; it isn't suitable for vinyl pool liners.
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    After putting on safety gear, fill an acid-resistant bucket with 5 parts water, then slowly add 1 part muriatic acid. Use a nylon scouring pad to apply the solution, scrubbing the tiles in a circular motion. Rinse with cold water. [24]
    • Protect yourself by wearing goggles, acid-resistant gloves , a long-sleeved shirt, and long pants. Put on a respirator and/or work in a well-ventilated area. [25]
    • Muriatic acid will damage marble, limestone, travertine, and onyx tile. [26]
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Section 5 of 6:

Can I throw away or recycle muriatic acid?

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    It puts sanitation workers at risk and can contaminate groundwater at landfills. [27] Instead, take it to a hazardous waste facility. Some recycling centers also accept hazardous household waste; call or visit their website to find out which products they accept. [28]
    • To find a hazardous waste drop-off location, check your city or county website and search for “household hazardous waste.” [29] Many cities also schedule a few days each year when sanitation workers will pick up hazardous waste.
Section 6 of 6:

How do I store muriatic acid?

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    Make sure it’s properly labeled and sealed. Keep the container upright in a dry, well-ventilated spot that's out of reach of children. [30]
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      References

      1. ↑ https://sciencing.com/dispose-methanol-8699726.html
      2. ↑ https://yardandgardenguru.com/how-to-dispose-of-muriatic-acid/
      3. ↑ https://www.nedt.org/muriatic-acid-what-it-is-and-why-its-a-cleaning-product/
      4. ↑ https://www.bobvila.com/articles/muriatic-acid/
      5. ↑ https://sciencing.com/dispose-hydrochloric-acid-8419934.html
      6. ↑ https://sciencing.com/dispose-hydrochloric-acid-8419934.html
      7. ↑ https://sciencing.com/dispose-hydrochloric-acid-8419934.html
      8. ↑ https://yardandgardenguru.com/how-to-dispose-of-muriatic-acid/
      9. ↑ https://www.nedt.org/muriatic-acid-what-it-is-and-why-its-a-cleaning-product/
      1. ↑ https://yardandgardenguru.com/how-to-dispose-of-muriatic-acid/
      2. ↑ https://yardandgardenguru.com/how-to-dispose-of-muriatic-acid/
      3. ↑ https://www.unodc.org/pdf/publications/st-nar-36.pdf
      4. ↑ https://sciencing.com/dispose-hydrochloric-acid-8419934.html
      5. ↑ https://yardandgardenguru.com/how-to-dispose-of-muriatic-acid/
      6. ↑ https://www.bobvila.com/articles/muriatic-acid/
      7. ↑ https://www.nedt.org/muriatic-acid-what-it-is-and-why-its-a-cleaning-product/
      8. ↑ https://www.nedt.org/muriatic-acid-what-it-is-and-why-its-a-cleaning-product/
      9. ↑ https://youtu.be/mHvTqW5ZKGs?t=25
      10. ↑ https://www.nedt.org/muriatic-acid-what-it-is-and-why-its-a-cleaning-product/
      11. ↑ https://www.popularmechanics.com/home/a34285564/how-to-safely-use-muriatic-acid/
      12. ↑ https://www.nedt.org/muriatic-acid-what-it-is-and-why-its-a-cleaning-product/
      13. ↑ https://www.poolspanews.com/how-to/maintenance/scale-tales_o
      14. ↑ https://www.nedt.org/muriatic-acid-what-it-is-and-why-its-a-cleaning-product/
      15. ↑ https://todayshomeowner.com/video/how-to-clean-tile-with-muriatic-acid/
      16. ↑ https://www.nedt.org/muriatic-acid-what-it-is-and-why-its-a-cleaning-product/
      17. ↑ https://www.rocktopsfabrication.com/wp-content/uploads/2016/04/care-maint.pdf
      18. ↑ https://sciencing.com/how-to-neutralize-an-acid-12524106.html
      19. ↑ https://sciencing.com/dispose-methanol-8699726.html
      20. ↑ https://sciencing.com/dispose-methanol-8699726.html
      21. ↑ https://www.sunnysidecorp.com/pdfs/SDS_71032.pdf
      22. ↑ https://www.nedt.org/muriatic-acid-what-it-is-and-why-its-a-cleaning-product/
      23. ↑ https://www.nedt.org/muriatic-acid-what-it-is-and-why-its-a-cleaning-product/
      24. ↑ https://www.bobvila.com/articles/muriatic-acid/
      25. ↑ https://www.sunnysidecorp.com/pdfs/SDS_71032.pdf
      26. ↑ https://www.bobvila.com/articles/muriatic-acid/
      27. ↑ https://yardandgardenguru.com/how-to-dispose-of-muriatic-acid/

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